Reaction catalyzed by methylenetetrahydrofolate reductase [NAD(P)H] (1.5.1.20), nitrate reductase (NADPH) (1.7.1.3), nitrate reductase (quinone) (1.7.5.1) show all sequences for 1.7.5.1
+
=
+
nitrate
+
reduced benzyl viologen
=
nitrite
+
benzyl viologen