Table 3 Protein ligands for B7 family and the glycosyltransferases involved in B7 family regulation

B7 family	Transferase	Protein ligand	Reference
PD-L1	STT3A/STT3B, B3GNT3, B4GALT1, MAN2A1, FUT8	PD-1	[ 66, 68– 72, 84, 85]
PD-L2	FUT8	PD-1	[77]
B7-H3	FUT8	TLT-2, IL20RA, PLA2R1	[ 79, 80]
B7-H4	STT3A, UGGT1	–	[83]