UMP(out) + UDP-alpha-D-galactose(in) = UMP(in) + UDP-alpha-D-galactose(out)
ump(out) + udp-alpha-d-galactose(in) = ump(in) + udp-alpha-d-galactose(out)
UMP(out) + UDP-alpha-D-galactose(in) = UMP(in) + UDP-alpha-D-galactose(out)
ump(out) + udp-alpha-d-galactose(in) = ump(in) + udp-alpha-d-galactose(out)