[thioredoxin]-dithiol + UDP => dUDP + [thioredoxin]-disulfide + H2O
[thioredoxin]-dithiol + udp => dudp + [thioredoxin]-disulfide + h2o
[thioredoxin]-dithiol + UDP => dUDP + [thioredoxin]-disulfide + H2O
[thioredoxin]-dithiol + udp => dudp + [thioredoxin]-disulfide + h2o