. "Catalysis of the transfer of a xylosyl group to an acceptor molecule, typically another carbohydrate or a lipid." . . "xylosyltransferase activity" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .