1.3.1.90	5,6-dihydrouracil20a in tRNA + NAD(P)+ = uracil20a in tRNA + NAD(P)H + H+	
1.3.1.90	5,6-dihydrouracil20b in tRNA + NAD(P)+ = uracil20b in tRNA + NAD(P)H + H+