N-acetyl-D-glucosamine + UDP-alpha-D-galactose = beta-D-galactosyl-(1->4)-N-acetyl-D-glucosamine + UDP + H(+)
n-acetyl-d-glucosamine + udp-alpha-d-galactose = beta-d-galactosyl-(1->4)-n-acetyl-d-glucosamine + udp + h(+)
N-acetyl-D-glucosamine + UDP-alpha-D-galactose = beta-D-galactosyl-(1->4)-N-acetyl-D-glucosamine + UDP + H(+)
n-acetyl-d-glucosamine + udp-alpha-d-galactose = beta-d-galactosyl-(1->4)-n-acetyl-d-glucosamine + udp + h(+)