2.4.1.90 N-acetyllactosamine synthase; UDP-galactose---N-acetylglucosamine beta-D-galactosyltransferase; uridine diphosphogalactose-acetylglucosamine galactosyltransferase; beta-1,4-galactosyltransferase; acetyllactosamine synthetase; lactosamine synthase; l • • •