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Assimilatory NAD(P)H Nitrate Reductase

An Iron-Sulfur and Molybdenum containing FLAVOPROTEIN that catalyzes the oxidation of nitrite to nitrate. This enzyme can use either NAD or NADP as cofactors. It is a key enzyme that is involved in the first step of nitrate assimilation in Plants; Fungi; and Bacteria. This enzyme was formerly classified as EC 1.6.6.2.