Sequence homology: Cow: 93%; Dog: 100%; Horse: 93%; Human: 100%; Mouse: 100%; Rabbit: 93%; Rat: 93%. Transfers N-acetylgalactosamine (GalNAc) from UDP-GalNAc to N-acetylglucosamine-beta-benzyl with a beta-1,4-linkage to form N,N'-diacetyllactosediamine,