an N-acetyl-beta-D-glucosaminyl derivative + UDP-alpha-D-galactose = a beta-D-galactosyl-(1->3)-N-acetyl-beta-D-glucosaminyl derivative + UDP + H(+)
an n-acetyl-beta-d-glucosaminyl derivative + udp-alpha-d-galactose = a beta-d-galactosyl-(1->3)-n-acetyl-beta-d-glucosaminyl derivative + udp + h(+)