a beta-D-galactosyl-(1->4)-N-acetyl-beta-D-glucosaminyl derivative + UDP-alpha-D-galactose = an alpha-D-galactosyl-(1->3)-beta-D-galactosyl-(1->4)-N-acetyl-beta-D-glucosaminyl derivative + UDP + H(+)
a beta-d-galactosyl-(1->4)-n-acetyl-beta-d-glucosaminyl derivative + udp-alpha-d-galactose = an alpha-d-galactosyl-(1->3)-beta-d-galactosyl-(1->4)-n-acetyl-beta-d-glucosaminyl derivative + udp + h(+)
"beta-D-galactosyl-N-acetylglucosaminylglycopeptide alpha-1,3-galactosyltransferase"
"beta-d-galactosyl-n-acetylglucosaminylglycopeptide alpha-1,3-galactosyltransferase"