an N-acylsphing-4-enine + UDP-alpha-D-galactose => a beta-D-galactosyl-(1<->1')-N-acylsphing-4-enine + UDP + H(+)
an n-acylsphing-4-enine + udp-alpha-d-galactose => a beta-d-galactosyl-(1<->1')-n-acylsphing-4-enine + udp + h(+)
an N-acylsphing-4-enine + UDP-alpha-D-galactose => a beta-D-galactosyl-(1<->1')-N-acylsphing-4-enine + UDP + H(+)
an n-acylsphing-4-enine + udp-alpha-d-galactose => a beta-d-galactosyl-(1<->1')-n-acylsphing-4-enine + udp + h(+)