collagen beta(1-O)galactosyltransferase 1-A glt25d1 glycosyltransferase 25 family member 1-A hydroxylysine galactosyltransferase 1-A glycosyltransferase 25 domain containing 1 b glt25d1b glt25d1-a colgalt1-a procollagen galactosyltransferase 1-A colgalt1