the mutants contained wild-type levels of xylosyltransferase ( udp-d-xylose : core protein ( serine ) beta-d-xylosyltransferase ) , lactose synthase ( udp-d-galactose : n-acetyl-glucosaminide beta-1,4-d-galactosyltransferase ) , and lactosylceramide synthase ( udp-d-galactose : glucosylceramide beta-1,4-d-galactosyltransferase ) .
C0022952
lactose synthase
C0016964
galactosyltransferase