q-dihydrobiopterin + NADH + H+ => tetrahydrobiopterin + NAD+ (Bos taurus)
q-dihydrobiopterin + nadh + h+ => tetrahydrobiopterin + nad+ (bos taurus)
q-dihydrobiopterin + NADH + H+ => tetrahydrobiopterin + NAD+ (Bos taurus)
q-dihydrobiopterin + nadh + h+ => tetrahydrobiopterin + nad+ (bos taurus)