Sequence homology: Cow: 86%; Dog: 100%; Guinea Pig: 100%; Horse: 100%; Human: 100%; Mouse: 100%; Rabbit: 100%; Rat: 100%; Sheep: 86%. Synthesis of alpha-2, 3-linked sialic acid to Gal(beta-1, 3)GalNAc is mediated by at least 3 distinct beta-galactoside a