Reference for ND

This reference documents the fact that a database curator has reviewed the literature describing a gene product but found no biologically useful information; it should only be cited for annotations to "unknown," i.e. one of

• molecular function unknown ; GO:0005554
• biological process unknown ; GO:0000004
• cellular component unknown ; GO:0008372

Description of the "ND" evidence code (for more information see the GO Evidence Codes documentation):

ND no biological data available

• Used for annotations to "unknown" molecular function, biological process, or cellular component.

Comment: This code is used only for annotations to "unknown," and it is the only evidence code recommended for annotations to unknown (except in cases where a cited source explicitly says that something is unknown). It should be accompanied by a reference that explains that curators looked but found no information. This page can serve as a generic reference to use with ND; to use it insert "GO_REF:nd" in the reference column of a gene_association file.

Composed by Midori Harris 2002-03-05

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