1.3.1.88 5,6-dihydrouracil16 in tRNA + NAD(P)+ = uracil16 in tRNA + NAD(P)H + H+ (1) 712355 1.3.1.88 5,6-dihydrouracil17 in tRNA + NAD(P)+ = uracil17 in tRNA + NAD(P)H + H+ (2) 712355