q-dihydrobiopterin + NADH + H+ => tetrahydrobiopterin + NAD+ (Xenopus tropicalis)
q-dihydrobiopterin + nadh + h+ => tetrahydrobiopterin + nad+ (xenopus tropicalis)
q-dihydrobiopterin + NADH + H+ => tetrahydrobiopterin + NAD+ (Xenopus tropicalis)
q-dihydrobiopterin + nadh + h+ => tetrahydrobiopterin + nad+ (xenopus tropicalis)