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