SIAT1
label: ST6GAL1
label: UniProt:P15907 ST6GAL1

GGNT5
label: MGAT5
label: UniProt:Q09328 MGAT5

CGS23
label: NANTA3
label: SIAT4C
label: ST3GAL4
label: STZ
label: UniProt:Q11206 ST3GAL4

Addition of GlcNAc to position 4 by N-acetylglucosaminyltransferase (GnT)-IV
type: Restriction
  on property: BFO_0000066
  some values from: GO_0000139
type: GO_0008454
BFO_0000050: N-Glycan antennae elongation

Addition of GlcNAc to position 5 by MGAT5
type: Restriction
  on property: BFO_0000066
  some values from: GO_0000139
type: Restriction
  on property: enabled by
  some values from: GGNT5
type: GO_0030144
BFO_0000050: N-Glycan antennae elongation

Addition of galactose by beta 4-galactosyltransferases
type: Restriction
  on property: BFO_0000066
  some values from: GO_0000139
type: GO_0003831
BFO_0000050: N-Glycan antennae elongation

Addition of alpha-2,6-sialic acid to terminal galactose of N-glycans by ST6GAL1
type: Restriction
  on property: BFO_0000066
  some values from: GO_0000139
type: Restriction
  on property: enabled by
  some values from: SIAT1
type: GO_0003835
BFO_0000050: N-Glycan antennae elongation

Addition of alpha-2,8-sialic acid to N-glycan over a galactose by ST8SIAs
type: Restriction
  on property: BFO_0000066
  some values from: GO_0000139
type: GO_0003828
BFO_0000050: N-Glycan antennae elongation

Addition of alpha-2,3-sialic acid to N-glycan over a galactose by ST3GAL4
type: Restriction
  on property: BFO_0000066
  some values from: GO_0000139
type: Restriction
  on property: enabled by
  some values from: CGS23
type: GO_0003836
BFO_0000050: N-Glycan antennae elongation

N-Glycan antennae elongation
type: GO_0008150