SIAT1
label: ST6GAL1
label: UniProt:P15907 ST6GAL1

SIAT7B
label: SIATL1
label: ST6GALNAC2
label: STHM
label: UniProt:Q9UJ37 ST6GALNAC2

Sialyltransferase I can add sialic acid to the Tn antigen at the alpha 6 position
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: Termination of O-glycan biosynthesis

Sialyltransferase I can add sialic acid to the T antigen at the alpha 6 position
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: Termination of O-glycan biosynthesis

GalNAc alpha-2,6-sialyltransferase II can add a sialic acid to the T antigen at the alpha 6 position
type: Restriction
  on property: BFO_0000066
  some values from: GO_0000139
type: Restriction
  on property: enabled by
  some values from: SIAT7B
type: GO_0008373
BFO_0000050: Termination of O-glycan biosynthesis

ST3GAL1-4 can add a sialic acid to the T antigen at the alpha 3 position
type: Restriction
  on property: BFO_0000066
  some values from: GO_0000139
type: GO_0003836
BFO_0000050: Termination of O-glycan biosynthesis
directly activates: ST6GALNAC3/4 can add a sialic acid to the sialyl T antigen to form the disialyl T antigen
directly activates: Catalysis1564

ST6GALNAC3/4 can add a sialic acid to the sialyl T antigen to form the disialyl T antigen
type: Restriction
  on property: BFO_0000066
  some values from: GO_0000139
type: GO_0047290
BFO_0000050: Termination of O-glycan biosynthesis

Termination of O-glycan biosynthesis
type: GO_0008150