. "Catalysis of the reaction: ammonium hydroxide + 3 NAD(P)+ + H2O = nitrite + 3 NAD(P)H + 3 H+." . . "nitrite reductase [NAD(P)H] activity" . "ammonium-hydroxide:NAD(P)+ oxidoreductase activity" . "assimilatory nitrite reductase activity" . "NAD(P)H2:nitrite oxidoreductase activity" . "NAD(P)H:nitrite oxidoreductase activity" . "NADH-nitrite oxidoreductase activity" . "NADPH-nitrite reductase activity" . "nitrite reductase (reduced nicotinamide adenine dinucleotide (phosphate)) activity" . "nitrite reductase [NAD(P)H2]" . . .