ID 2.4.1.90 DE N-acetyllactosamine synthase. AN acetyllactosamine synthetase. AN N-acetylglucosamine (beta1,4)galactosyltransferase. AN NAL synthetase. AN UDP-galactose-N-acetylglucosamine beta-D-galactosyltransferase. AN UDP-galactose--N-acetylglucosamine beta-D-galactosyltransferase. CA N-acetyl-D-glucosamine + UDP-alpha-D-galactose = beta-D-galactosyl- CA (1->4)-N-acetyl-D-glucosamine + H(+) + UDP. CC -!- The reaction is catalyzed by a component of EC 2.4.1.22, which is CC identical with EC 2.4.1.38, and by an enzyme from the Golgi apparatus CC of animal tissues. CC -!- Formerly EC 2.4.1.98. DR P08037, B4GT1_BOVIN; P15291, B4GT1_HUMAN; P15535, B4GT1_MOUSE; DR P80225, B4GT1_RAT ; Q80WN9, B4GT2_CRIGR; O60909, B4GT2_HUMAN; DR Q9Z2Y2, B4GT2_MOUSE; Q5EA87, B4GT3_BOVIN; Q80WN8, B4GT3_CRIGR; DR O60512, B4GT3_HUMAN; Q91YY2, B4GT3_MOUSE; Q5NVN3, B4GT3_PONAB; DR Q6P768, B4GT3_RAT ; Q80WN7, B4GT4_CRIGR; O60513, B4GT4_HUMAN; DR Q9JJ04, B4GT4_MOUSE; Q66HH1, B4GT4_RAT ; //