label: xylosylprotein 4-beta-galactosyltransferase activity
label_lc: xylosylprotein 4-beta-galactosyltransferase activity
description: "Catalysis of the reaction: UDP-galactose + O-beta-D-xylosylprotein = UDP + 4-beta-D-galactosyl-O-beta-D-xylosylprotein."