5-methyl-UDP(out) + UTP(in) <=> 5-methyl-UDP(in) + UTP(out)
5-methyl-udp(out) + utp(in) <=> 5-methyl-udp(in) + utp(out)
5-methyl-UDP(out) + UTP(in) <=> 5-methyl-UDP(in) + UTP(out)
5-methyl-udp(out) + utp(in) <=> 5-methyl-udp(in) + utp(out)