N-acyl-D-galactosylsphing-4-enine + UDP + H(+) => an N-acylsphing-4-enine + UDP-alpha-D-galactose
n-acyl-d-galactosylsphing-4-enine + udp + h(+) => an n-acylsphing-4-enine + udp-alpha-d-galactose
N-acyl-D-galactosylsphing-4-enine + UDP + H(+) => an N-acylsphing-4-enine + UDP-alpha-D-galactose
n-acyl-d-galactosylsphing-4-enine + udp + h(+) => an n-acylsphing-4-enine + udp-alpha-d-galactose