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