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         <PDBx:journal_abbrev>Structure</PDBx:journal_abbrev>
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         <PDBx:title>The 1.1 A crystal structure of the neuronal acetylcholine receptor antagonist, alpha-conotoxin PnIA from Conus pennaceus.</PDBx:title>
         <PDBx:year>1996</PDBx:year>
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         <PDBx:title>Snb: Crystal Structure Determination Via Shake-and-Bake</PDBx:title>
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         <PDBx:country>US</PDBx:country>
         <PDBx:journal_abbrev>Biochemistry</PDBx:journal_abbrev>
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         <PDBx:journal_id_CSD>0033</PDBx:journal_id_CSD>
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         <PDBx:title>New Mollusc-Specific Alpha-Conotoxins Block Aplysia Neuronal Acetylcholine Receptors</PDBx:title>
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      </PDBx:pdbx_audit_revision_details>
   </PDBx:pdbx_audit_revision_detailsCategory>
   <PDBx:pdbx_audit_revision_groupCategory>
      <PDBx:pdbx_audit_revision_group data_content_type="Structure model" ordinal="1" revision_ordinal="2">
         <PDBx:group>Version format compliance</PDBx:group>
      </PDBx:pdbx_audit_revision_group>
      <PDBx:pdbx_audit_revision_group data_content_type="Structure model" ordinal="2" revision_ordinal="3">
         <PDBx:group>Version format compliance</PDBx:group>
      </PDBx:pdbx_audit_revision_group>
   </PDBx:pdbx_audit_revision_groupCategory>
   <PDBx:pdbx_audit_revision_historyCategory>
      <PDBx:pdbx_audit_revision_history data_content_type="Structure model" ordinal="1">
         <PDBx:major_revision>1</PDBx:major_revision>
         <PDBx:minor_revision>0</PDBx:minor_revision>
         <PDBx:revision_date>1997-04-21</PDBx:revision_date>
      </PDBx:pdbx_audit_revision_history>
      <PDBx:pdbx_audit_revision_history data_content_type="Structure model" ordinal="2">
         <PDBx:major_revision>1</PDBx:major_revision>
         <PDBx:minor_revision>1</PDBx:minor_revision>
         <PDBx:revision_date>2008-03-24</PDBx:revision_date>
      </PDBx:pdbx_audit_revision_history>
      <PDBx:pdbx_audit_revision_history data_content_type="Structure model" ordinal="3">
         <PDBx:major_revision>1</PDBx:major_revision>
         <PDBx:minor_revision>2</PDBx:minor_revision>
         <PDBx:revision_date>2011-07-13</PDBx:revision_date>
      </PDBx:pdbx_audit_revision_history>
   </PDBx:pdbx_audit_revision_historyCategory>
   <PDBx:pdbx_database_statusCategory>
      <PDBx:pdbx_database_status entry_id="1PEN">
         <PDBx:SG_entry xsi:nil="true" />
         <PDBx:pdb_format_compatible>Y</PDBx:pdb_format_compatible>
         <PDBx:process_site>BNL</PDBx:process_site>
         <PDBx:recvd_initial_deposition_date>1996-01-29</PDBx:recvd_initial_deposition_date>
         <PDBx:status_code>REL</PDBx:status_code>
      </PDBx:pdbx_database_status>
   </PDBx:pdbx_database_statusCategory>
   <PDBx:pdbx_entity_nonpolyCategory>
      <PDBx:pdbx_entity_nonpoly entity_id="2">
         <PDBx:comp_id>HOH</PDBx:comp_id>
         <PDBx:name>water</PDBx:name>
      </PDBx:pdbx_entity_nonpoly>
   </PDBx:pdbx_entity_nonpolyCategory>
   <PDBx:pdbx_nonpoly_schemeCategory>
      <PDBx:pdbx_nonpoly_scheme asym_id="B" ndb_seq_num="1">
         <PDBx:auth_mon_id>HOH</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>17</PDBx:auth_seq_num>
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:mon_id>HOH</PDBx:mon_id>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>HOH</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>18</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_nonpoly_scheme>
      <PDBx:pdbx_nonpoly_scheme asym_id="B" ndb_seq_num="2">
         <PDBx:auth_mon_id>HOH</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>18</PDBx:auth_seq_num>
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:mon_id>HOH</PDBx:mon_id>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>HOH</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>19</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_nonpoly_scheme>
      <PDBx:pdbx_nonpoly_scheme asym_id="B" ndb_seq_num="3">
         <PDBx:auth_mon_id>HOH</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>19</PDBx:auth_seq_num>
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:mon_id>HOH</PDBx:mon_id>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>HOH</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>20</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_nonpoly_scheme>
      <PDBx:pdbx_nonpoly_scheme asym_id="B" ndb_seq_num="4">
         <PDBx:auth_mon_id>HOH</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>20</PDBx:auth_seq_num>
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:mon_id>HOH</PDBx:mon_id>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>HOH</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>21</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_nonpoly_scheme>
      <PDBx:pdbx_nonpoly_scheme asym_id="B" ndb_seq_num="5">
         <PDBx:auth_mon_id>HOH</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>21</PDBx:auth_seq_num>
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:mon_id>HOH</PDBx:mon_id>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>HOH</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>22</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_nonpoly_scheme>
      <PDBx:pdbx_nonpoly_scheme asym_id="B" ndb_seq_num="6">
         <PDBx:auth_mon_id>HOH</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>22</PDBx:auth_seq_num>
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:mon_id>HOH</PDBx:mon_id>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>HOH</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>23</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_nonpoly_scheme>
      <PDBx:pdbx_nonpoly_scheme asym_id="B" ndb_seq_num="7">
         <PDBx:auth_mon_id>HOH</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>23</PDBx:auth_seq_num>
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:mon_id>HOH</PDBx:mon_id>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>HOH</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>24</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_nonpoly_scheme>
      <PDBx:pdbx_nonpoly_scheme asym_id="B" ndb_seq_num="8">
         <PDBx:auth_mon_id>HOH</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>24</PDBx:auth_seq_num>
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:mon_id>HOH</PDBx:mon_id>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>HOH</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>25</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_nonpoly_scheme>
      <PDBx:pdbx_nonpoly_scheme asym_id="B" ndb_seq_num="9">
         <PDBx:auth_mon_id>HOH</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>25</PDBx:auth_seq_num>
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:mon_id>HOH</PDBx:mon_id>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>HOH</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>26</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_nonpoly_scheme>
      <PDBx:pdbx_nonpoly_scheme asym_id="B" ndb_seq_num="10">
         <PDBx:auth_mon_id>HOH</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>26</PDBx:auth_seq_num>
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:mon_id>HOH</PDBx:mon_id>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>HOH</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>27</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_nonpoly_scheme>
      <PDBx:pdbx_nonpoly_scheme asym_id="B" ndb_seq_num="11">
         <PDBx:auth_mon_id>HOH</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>27</PDBx:auth_seq_num>
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:mon_id>HOH</PDBx:mon_id>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>HOH</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>28</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_nonpoly_scheme>
      <PDBx:pdbx_nonpoly_scheme asym_id="B" ndb_seq_num="12">
         <PDBx:auth_mon_id>HOH</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>28</PDBx:auth_seq_num>
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:mon_id>HOH</PDBx:mon_id>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>HOH</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>29</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_nonpoly_scheme>
   </PDBx:pdbx_nonpoly_schemeCategory>
   <PDBx:pdbx_poly_seq_schemeCategory>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="GLY" seq_id="1">
         <PDBx:auth_mon_id>GLY</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>1</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>1</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>GLY</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>1</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="CYS" seq_id="2">
         <PDBx:auth_mon_id>CYS</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>2</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>2</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>CYS</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>2</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="CYS" seq_id="3">
         <PDBx:auth_mon_id>CYS</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>3</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>3</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>CYS</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>3</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="SER" seq_id="4">
         <PDBx:auth_mon_id>SER</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>4</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>4</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>SER</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>4</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="LEU" seq_id="5">
         <PDBx:auth_mon_id>LEU</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>5</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>5</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>LEU</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>5</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="PRO" seq_id="6">
         <PDBx:auth_mon_id>PRO</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>6</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>6</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>PRO</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>6</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="PRO" seq_id="7">
         <PDBx:auth_mon_id>PRO</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>7</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>7</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>PRO</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>7</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="CYS" seq_id="8">
         <PDBx:auth_mon_id>CYS</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>8</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>8</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>CYS</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>8</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="ALA" seq_id="9">
         <PDBx:auth_mon_id>ALA</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>9</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>9</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>ALA</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>9</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="ALA" seq_id="10">
         <PDBx:auth_mon_id>ALA</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>10</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>10</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>ALA</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>10</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="ASN" seq_id="11">
         <PDBx:auth_mon_id>ASN</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>11</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>11</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>ASN</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>11</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="ASN" seq_id="12">
         <PDBx:auth_mon_id>ASN</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>12</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>12</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>ASN</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>12</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="PRO" seq_id="13">
         <PDBx:auth_mon_id>PRO</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>13</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>13</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>PRO</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>13</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="ASP" seq_id="14">
         <PDBx:auth_mon_id>ASP</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>14</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>14</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>ASP</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>14</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="TYR" seq_id="15">
         <PDBx:auth_mon_id>TYR</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>15</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>15</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>TYR</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>15</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="CYS" seq_id="16">
         <PDBx:auth_mon_id>CYS</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>16</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>16</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>CYS</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>16</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
      <PDBx:pdbx_poly_seq_scheme asym_id="A" entity_id="1" mon_id="NH2" seq_id="17">
         <PDBx:auth_mon_id>NH2</PDBx:auth_mon_id>
         <PDBx:auth_seq_num>17</PDBx:auth_seq_num>
         <PDBx:hetero>n</PDBx:hetero>
         <PDBx:ndb_seq_num>17</PDBx:ndb_seq_num>
         <PDBx:pdb_ins_code xsi:nil="true" />
         <PDBx:pdb_mon_id>NH2</PDBx:pdb_mon_id>
         <PDBx:pdb_seq_num>17</PDBx:pdb_seq_num>
         <PDBx:pdb_strand_id>A</PDBx:pdb_strand_id>
      </PDBx:pdbx_poly_seq_scheme>
   </PDBx:pdbx_poly_seq_schemeCategory>
   <PDBx:pdbx_struct_assemblyCategory>
      <PDBx:pdbx_struct_assembly id="1">
         <PDBx:details>author_defined_assembly</PDBx:details>
         <PDBx:oligomeric_count>1</PDBx:oligomeric_count>
         <PDBx:oligomeric_details>monomeric</PDBx:oligomeric_details>
      </PDBx:pdbx_struct_assembly>
   </PDBx:pdbx_struct_assemblyCategory>
   <PDBx:pdbx_struct_assembly_genCategory>
      <PDBx:pdbx_struct_assembly_gen assembly_id="1" asym_id_list="A,B" oper_expression="1"></PDBx:pdbx_struct_assembly_gen>
   </PDBx:pdbx_struct_assembly_genCategory>
   <PDBx:pdbx_struct_oper_listCategory>
      <PDBx:pdbx_struct_oper_list id="1">
         <PDBx:matrix11>1.0000000000</PDBx:matrix11>
         <PDBx:matrix12>0.0000000000</PDBx:matrix12>
         <PDBx:matrix13>0.0000000000</PDBx:matrix13>
         <PDBx:matrix21>0.0000000000</PDBx:matrix21>
         <PDBx:matrix22>1.0000000000</PDBx:matrix22>
         <PDBx:matrix23>0.0000000000</PDBx:matrix23>
         <PDBx:matrix31>0.0000000000</PDBx:matrix31>
         <PDBx:matrix32>0.0000000000</PDBx:matrix32>
         <PDBx:matrix33>1.0000000000</PDBx:matrix33>
         <PDBx:name>1_555</PDBx:name>
         <PDBx:symmetry_operation>x,y,z</PDBx:symmetry_operation>
         <PDBx:type>identity operation</PDBx:type>
         <PDBx:vector1>0.0000000000</PDBx:vector1>
         <PDBx:vector2>0.0000000000</PDBx:vector2>
         <PDBx:vector3>0.0000000000</PDBx:vector3>
      </PDBx:pdbx_struct_oper_list>
   </PDBx:pdbx_struct_oper_listCategory>
   <PDBx:refineCategory>
      <PDBx:refine entry_id="1PEN" pdbx_refine_id="X-RAY DIFFRACTION">
         <PDBx:B_iso_mean>7.6</PDBx:B_iso_mean>
         <PDBx:ls_R_factor_R_free>0.152</PDBx:ls_R_factor_R_free>
         <PDBx:ls_R_factor_R_work>0.127</PDBx:ls_R_factor_R_work>
         <PDBx:ls_R_factor_obs>0.127</PDBx:ls_R_factor_obs>
         <PDBx:ls_d_res_high>1.1</PDBx:ls_d_res_high>
         <PDBx:ls_d_res_low>6.1</PDBx:ls_d_res_low>
         <PDBx:ls_number_reflns_R_free>245</PDBx:ls_number_reflns_R_free>
         <PDBx:ls_number_reflns_obs>2536</PDBx:ls_number_reflns_obs>
         <PDBx:ls_percent_reflns_R_free>10.</PDBx:ls_percent_reflns_R_free>
         <PDBx:ls_percent_reflns_obs>70.</PDBx:ls_percent_reflns_obs>
         <PDBx:pdbx_diffrn_id>1</PDBx:pdbx_diffrn_id>
         <PDBx:pdbx_ls_sigma_F>2.</PDBx:pdbx_ls_sigma_F>
      </PDBx:refine>
   </PDBx:refineCategory>
   <PDBx:refine_analyzeCategory>
      <PDBx:refine_analyze entry_id="1PEN" pdbx_refine_id="X-RAY DIFFRACTION">
         <PDBx:Luzzati_coordinate_error_obs>0.1</PDBx:Luzzati_coordinate_error_obs>
      </PDBx:refine_analyze>
   </PDBx:refine_analyzeCategory>
   <PDBx:refine_histCategory>
      <PDBx:refine_hist cycle_id="LAST" pdbx_refine_id="X-RAY DIFFRACTION">
         <PDBx:d_res_high>1.1</PDBx:d_res_high>
         <PDBx:d_res_low>6.1</PDBx:d_res_low>
         <PDBx:number_atoms_solvent>12</PDBx:number_atoms_solvent>
         <PDBx:number_atoms_total>122</PDBx:number_atoms_total>
         <PDBx:pdbx_number_atoms_ligand>0</PDBx:pdbx_number_atoms_ligand>
         <PDBx:pdbx_number_atoms_nucleic_acid>0</PDBx:pdbx_number_atoms_nucleic_acid>
         <PDBx:pdbx_number_atoms_protein>110</PDBx:pdbx_number_atoms_protein>
      </PDBx:refine_hist>
   </PDBx:refine_histCategory>
   <PDBx:refine_ls_restrCategory>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_bond_d">
         <PDBx:dev_ideal>0.005</PDBx:dev_ideal>
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_bond_d_na">
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_bond_d_prot">
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_angle_d">
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_angle_d_na">
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_angle_d_prot">
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_angle_deg">
         <PDBx:dev_ideal>1.6</PDBx:dev_ideal>
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_angle_deg_na">
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_angle_deg_prot">
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_dihedral_angle_d">
         <PDBx:dev_ideal>22.7</PDBx:dev_ideal>
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_dihedral_angle_d_na">
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_dihedral_angle_d_prot">
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_improper_angle_d">
         <PDBx:dev_ideal>1.5</PDBx:dev_ideal>
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_improper_angle_d_na">
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_improper_angle_d_prot">
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_mcbond_it">
         <PDBx:dev_ideal_target>1.5</PDBx:dev_ideal_target>
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_mcangle_it">
         <PDBx:dev_ideal_target>2.0</PDBx:dev_ideal_target>
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_scbond_it">
         <PDBx:dev_ideal_target>2.0</PDBx:dev_ideal_target>
      </PDBx:refine_ls_restr>
      <PDBx:refine_ls_restr pdbx_refine_id="X-RAY DIFFRACTION" type="x_scangle_it">
         <PDBx:dev_ideal_target>2.5</PDBx:dev_ideal_target>
      </PDBx:refine_ls_restr>
   </PDBx:refine_ls_restrCategory>
   <PDBx:reflnsCategory>
      <PDBx:reflns pdbx_ordinal="1">
         <PDBx:d_resolution_high>1.1</PDBx:d_resolution_high>
         <PDBx:d_resolution_low>50.</PDBx:d_resolution_low>
         <PDBx:entry_id>1PEN</PDBx:entry_id>
         <PDBx:number_obs>3459</PDBx:number_obs>
         <PDBx:observed_criterion_sigma_I>1.</PDBx:observed_criterion_sigma_I>
         <PDBx:pdbx_Rmerge_I_obs>0.08</PDBx:pdbx_Rmerge_I_obs>
         <PDBx:pdbx_diffrn_id>1</PDBx:pdbx_diffrn_id>
         <PDBx:pdbx_redundancy>4.7</PDBx:pdbx_redundancy>
         <PDBx:percent_possible_obs>94.</PDBx:percent_possible_obs>
      </PDBx:reflns>
   </PDBx:reflnsCategory>
   <PDBx:softwareCategory>
      <PDBx:software pdbx_ordinal="1">
         <PDBx:classification>data reduction</PDBx:classification>
         <PDBx:name>DENZO</PDBx:name>
         <PDBx:version xsi:nil="true" />
      </PDBx:software>
      <PDBx:software pdbx_ordinal="2">
         <PDBx:classification>model building</PDBx:classification>
         <PDBx:name>X-PLOR</PDBx:name>
         <PDBx:version>3.1</PDBx:version>
      </PDBx:software>
      <PDBx:software pdbx_ordinal="3">
         <PDBx:classification>refinement</PDBx:classification>
         <PDBx:name>X-PLOR</PDBx:name>
         <PDBx:version>3.1</PDBx:version>
      </PDBx:software>
      <PDBx:software pdbx_ordinal="4">
         <PDBx:classification>phasing</PDBx:classification>
         <PDBx:name>X-PLOR</PDBx:name>
         <PDBx:version>3.1</PDBx:version>
      </PDBx:software>
   </PDBx:softwareCategory>
   <PDBx:structCategory>
      <PDBx:struct entry_id="1PEN">
         <PDBx:pdbx_descriptor>ALPHA-CONOTOXIN PNIA</PDBx:pdbx_descriptor>
         <PDBx:title>ALPHA-CONOTOXIN PNI1</PDBx:title>
      </PDBx:struct>
   </PDBx:structCategory>
   <PDBx:struct_asymCategory>
      <PDBx:struct_asym id="A">
         <PDBx:entity_id>1</PDBx:entity_id>
         <PDBx:pdbx_blank_PDB_chainid_flag>N</PDBx:pdbx_blank_PDB_chainid_flag>
         <PDBx:pdbx_modified>N</PDBx:pdbx_modified>
      </PDBx:struct_asym>
      <PDBx:struct_asym id="B">
         <PDBx:entity_id>2</PDBx:entity_id>
         <PDBx:pdbx_blank_PDB_chainid_flag>N</PDBx:pdbx_blank_PDB_chainid_flag>
         <PDBx:pdbx_modified>N</PDBx:pdbx_modified>
      </PDBx:struct_asym>
   </PDBx:struct_asymCategory>
   <PDBx:struct_biolCategory>
      <PDBx:struct_biol id="1"></PDBx:struct_biol>
   </PDBx:struct_biolCategory>
   <PDBx:struct_confCategory>
      <PDBx:struct_conf id="HELX_P1">
         <PDBx:beg_auth_asym_id>A</PDBx:beg_auth_asym_id>
         <PDBx:beg_auth_comp_id>LEU</PDBx:beg_auth_comp_id>
         <PDBx:beg_auth_seq_id>5</PDBx:beg_auth_seq_id>
         <PDBx:beg_label_asym_id>A</PDBx:beg_label_asym_id>
         <PDBx:beg_label_comp_id>LEU</PDBx:beg_label_comp_id>
         <PDBx:beg_label_seq_id>5</PDBx:beg_label_seq_id>
         <PDBx:conf_type_id>HELX_P</PDBx:conf_type_id>
         <PDBx:end_auth_asym_id>A</PDBx:end_auth_asym_id>
         <PDBx:end_auth_comp_id>ASN</PDBx:end_auth_comp_id>
         <PDBx:end_auth_seq_id>11</PDBx:end_auth_seq_id>
         <PDBx:end_label_asym_id>A</PDBx:end_label_asym_id>
         <PDBx:end_label_comp_id>ASN</PDBx:end_label_comp_id>
         <PDBx:end_label_seq_id>11</PDBx:end_label_seq_id>
         <PDBx:pdbx_PDB_helix_class>1</PDBx:pdbx_PDB_helix_class>
         <PDBx:pdbx_PDB_helix_id>1</PDBx:pdbx_PDB_helix_id>
         <PDBx:pdbx_PDB_helix_length>7</PDBx:pdbx_PDB_helix_length>
      </PDBx:struct_conf>
   </PDBx:struct_confCategory>
   <PDBx:struct_conf_typeCategory>
      <PDBx:struct_conf_type id="HELX_P">
      </PDBx:struct_conf_type>
   </PDBx:struct_conf_typeCategory>
   <PDBx:struct_connCategory>
      <PDBx:struct_conn id="disulf1">
         <PDBx:conn_type_id>disulf</PDBx:conn_type_id>
         <PDBx:pdbx_dist_value>2.027</PDBx:pdbx_dist_value>
         <PDBx:ptnr1_auth_asym_id>A</PDBx:ptnr1_auth_asym_id>
         <PDBx:ptnr1_auth_comp_id>CYS</PDBx:ptnr1_auth_comp_id>
         <PDBx:ptnr1_auth_seq_id>2</PDBx:ptnr1_auth_seq_id>
         <PDBx:ptnr1_label_asym_id>A</PDBx:ptnr1_label_asym_id>
         <PDBx:ptnr1_label_atom_id>SG</PDBx:ptnr1_label_atom_id>
         <PDBx:ptnr1_label_comp_id>CYS</PDBx:ptnr1_label_comp_id>
         <PDBx:ptnr1_label_seq_id>2</PDBx:ptnr1_label_seq_id>
         <PDBx:ptnr1_symmetry>1_555</PDBx:ptnr1_symmetry>
         <PDBx:ptnr2_auth_asym_id>A</PDBx:ptnr2_auth_asym_id>
         <PDBx:ptnr2_auth_comp_id>CYS</PDBx:ptnr2_auth_comp_id>
         <PDBx:ptnr2_auth_seq_id>8</PDBx:ptnr2_auth_seq_id>
         <PDBx:ptnr2_label_asym_id>A</PDBx:ptnr2_label_asym_id>
         <PDBx:ptnr2_label_atom_id>SG</PDBx:ptnr2_label_atom_id>
         <PDBx:ptnr2_label_comp_id>CYS</PDBx:ptnr2_label_comp_id>
         <PDBx:ptnr2_label_seq_id>8</PDBx:ptnr2_label_seq_id>
         <PDBx:ptnr2_symmetry>1_555</PDBx:ptnr2_symmetry>
      </PDBx:struct_conn>
      <PDBx:struct_conn id="disulf2">
         <PDBx:conn_type_id>disulf</PDBx:conn_type_id>
         <PDBx:pdbx_dist_value>2.029</PDBx:pdbx_dist_value>
         <PDBx:ptnr1_auth_asym_id>A</PDBx:ptnr1_auth_asym_id>
         <PDBx:ptnr1_auth_comp_id>CYS</PDBx:ptnr1_auth_comp_id>
         <PDBx:ptnr1_auth_seq_id>3</PDBx:ptnr1_auth_seq_id>
         <PDBx:ptnr1_label_asym_id>A</PDBx:ptnr1_label_asym_id>
         <PDBx:ptnr1_label_atom_id>SG</PDBx:ptnr1_label_atom_id>
         <PDBx:ptnr1_label_comp_id>CYS</PDBx:ptnr1_label_comp_id>
         <PDBx:ptnr1_label_seq_id>3</PDBx:ptnr1_label_seq_id>
         <PDBx:ptnr1_symmetry>1_555</PDBx:ptnr1_symmetry>
         <PDBx:ptnr2_auth_asym_id>A</PDBx:ptnr2_auth_asym_id>
         <PDBx:ptnr2_auth_comp_id>CYS</PDBx:ptnr2_auth_comp_id>
         <PDBx:ptnr2_auth_seq_id>16</PDBx:ptnr2_auth_seq_id>
         <PDBx:ptnr2_label_asym_id>A</PDBx:ptnr2_label_asym_id>
         <PDBx:ptnr2_label_atom_id>SG</PDBx:ptnr2_label_atom_id>
         <PDBx:ptnr2_label_comp_id>CYS</PDBx:ptnr2_label_comp_id>
         <PDBx:ptnr2_label_seq_id>16</PDBx:ptnr2_label_seq_id>
         <PDBx:ptnr2_symmetry>1_555</PDBx:ptnr2_symmetry>
      </PDBx:struct_conn>
      <PDBx:struct_conn id="covale1">
         <PDBx:conn_type_id>covale</PDBx:conn_type_id>
         <PDBx:pdbx_dist_value>1.319</PDBx:pdbx_dist_value>
         <PDBx:ptnr1_auth_asym_id>A</PDBx:ptnr1_auth_asym_id>
         <PDBx:ptnr1_auth_comp_id>NH2</PDBx:ptnr1_auth_comp_id>
         <PDBx:ptnr1_auth_seq_id>17</PDBx:ptnr1_auth_seq_id>
         <PDBx:ptnr1_label_asym_id>A</PDBx:ptnr1_label_asym_id>
         <PDBx:ptnr1_label_atom_id>N</PDBx:ptnr1_label_atom_id>
         <PDBx:ptnr1_label_comp_id>NH2</PDBx:ptnr1_label_comp_id>
         <PDBx:ptnr1_label_seq_id>17</PDBx:ptnr1_label_seq_id>
         <PDBx:ptnr1_symmetry>1_555</PDBx:ptnr1_symmetry>
         <PDBx:ptnr2_auth_asym_id>A</PDBx:ptnr2_auth_asym_id>
         <PDBx:ptnr2_auth_comp_id>CYS</PDBx:ptnr2_auth_comp_id>
         <PDBx:ptnr2_auth_seq_id>16</PDBx:ptnr2_auth_seq_id>
         <PDBx:ptnr2_label_asym_id>A</PDBx:ptnr2_label_asym_id>
         <PDBx:ptnr2_label_atom_id>C</PDBx:ptnr2_label_atom_id>
         <PDBx:ptnr2_label_comp_id>CYS</PDBx:ptnr2_label_comp_id>
         <PDBx:ptnr2_label_seq_id>16</PDBx:ptnr2_label_seq_id>
         <PDBx:ptnr2_symmetry>1_555</PDBx:ptnr2_symmetry>
      </PDBx:struct_conn>
   </PDBx:struct_connCategory>
   <PDBx:struct_conn_typeCategory>
      <PDBx:struct_conn_type id="disulf">
      </PDBx:struct_conn_type>
      <PDBx:struct_conn_type id="covale">
      </PDBx:struct_conn_type>
   </PDBx:struct_conn_typeCategory>
   <PDBx:struct_keywordsCategory>
      <PDBx:struct_keywords entry_id="1PEN">
         <PDBx:pdbx_keywords>NEUROTOXIN</PDBx:pdbx_keywords>
         <PDBx:text>NEUROTOXIN, ACETYLCHOLINE RECEPTOR, POSTSYNAPTIC, ANTAGONIST, ACETYLCHOLINE RECEPTOR INHIBITOR</PDBx:text>
      </PDBx:struct_keywords>
   </PDBx:struct_keywordsCategory>
   <PDBx:struct_refCategory>
      <PDBx:struct_ref id="1">
         <PDBx:db_code>CXAA_CONPE</PDBx:db_code>
         <PDBx:db_name>UNP</PDBx:db_name>
         <PDBx:entity_id>1</PDBx:entity_id>
         <PDBx:pdbx_align_begin>1</PDBx:pdbx_align_begin>
         <PDBx:pdbx_db_accession>P50984</PDBx:pdbx_db_accession>
         <PDBx:pdbx_seq_one_letter_code>GCCSLPPCAANNPDYC</PDBx:pdbx_seq_one_letter_code>
      </PDBx:struct_ref>
   </PDBx:struct_refCategory>
   <PDBx:struct_ref_seqCategory>
      <PDBx:struct_ref_seq align_id="1">
         <PDBx:db_align_beg>1</PDBx:db_align_beg>
         <PDBx:db_align_end>16</PDBx:db_align_end>
         <PDBx:pdbx_PDB_id_code>1PEN</PDBx:pdbx_PDB_id_code>
         <PDBx:pdbx_auth_seq_align_beg>1</PDBx:pdbx_auth_seq_align_beg>
         <PDBx:pdbx_auth_seq_align_end>16</PDBx:pdbx_auth_seq_align_end>
         <PDBx:pdbx_db_accession>P50984</PDBx:pdbx_db_accession>
         <PDBx:pdbx_strand_id>A</PDBx:pdbx_strand_id>
         <PDBx:ref_id>1</PDBx:ref_id>
         <PDBx:seq_align_beg>1</PDBx:seq_align_beg>
         <PDBx:seq_align_end>16</PDBx:seq_align_end>
      </PDBx:struct_ref_seq>
   </PDBx:struct_ref_seqCategory>
   <PDBx:struct_siteCategory>
      <PDBx:struct_site id="AC1">
         <PDBx:details>BINDING SITE FOR RESIDUE NH2 A 17</PDBx:details>
         <PDBx:pdbx_evidence_code>Software</PDBx:pdbx_evidence_code>
         <PDBx:pdbx_num_residues>2</PDBx:pdbx_num_residues>
      </PDBx:struct_site>
   </PDBx:struct_siteCategory>
   <PDBx:struct_site_genCategory>
      <PDBx:struct_site_gen id="1" site_id="AC1">
         <PDBx:auth_asym_id>A</PDBx:auth_asym_id>
         <PDBx:auth_comp_id>PRO</PDBx:auth_comp_id>
         <PDBx:auth_seq_id>13</PDBx:auth_seq_id>
         <PDBx:label_asym_id>A</PDBx:label_asym_id>
         <PDBx:label_atom_id xsi:nil="true" />
         <PDBx:label_comp_id>PRO</PDBx:label_comp_id>
         <PDBx:label_seq_id>13</PDBx:label_seq_id>
         <PDBx:pdbx_num_res>2</PDBx:pdbx_num_res>
         <PDBx:symmetry>1_555</PDBx:symmetry>
      </PDBx:struct_site_gen>
      <PDBx:struct_site_gen id="2" site_id="AC1">
         <PDBx:auth_asym_id>A</PDBx:auth_asym_id>
         <PDBx:auth_comp_id>CYS</PDBx:auth_comp_id>
         <PDBx:auth_seq_id>16</PDBx:auth_seq_id>
         <PDBx:label_asym_id>A</PDBx:label_asym_id>
         <PDBx:label_atom_id xsi:nil="true" />
         <PDBx:label_comp_id>CYS</PDBx:label_comp_id>
         <PDBx:label_seq_id>16</PDBx:label_seq_id>
         <PDBx:pdbx_num_res>2</PDBx:pdbx_num_res>
         <PDBx:symmetry>1_555</PDBx:symmetry>
      </PDBx:struct_site_gen>
   </PDBx:struct_site_genCategory>
   <PDBx:symmetryCategory>
      <PDBx:symmetry entry_id="1PEN">
         <PDBx:Int_Tables_number>4</PDBx:Int_Tables_number>
         <PDBx:space_group_name_H-M>P 1 21 1</PDBx:space_group_name_H-M>
      </PDBx:symmetry>
   </PDBx:symmetryCategory>
</PDBx:datablock>
