UMP(out) + CMP-N-acetyl-beta-neuraminate(in) <=> UMP(in) + CMP-N-acetyl-beta-neuraminate(out)
ump(out) + cmp-n-acetyl-beta-neuraminate(in) <=> ump(in) + cmp-n-acetyl-beta-neuraminate(out)
UMP(out) + CMP-N-acetyl-beta-neuraminate(in) <=> UMP(in) + CMP-N-acetyl-beta-neuraminate(out)
ump(out) + cmp-n-acetyl-beta-neuraminate(in) <=> ump(in) + cmp-n-acetyl-beta-neuraminate(out)