Figure 1.

(a) Reduction of nitrate by the nitrate reductase enzyme via OAT; (b) reduction of nitrite by the nitrite reductase enzyme using H+/e−; (c) reduction of nitrate to nitric oxide via nitrite by thiols at copper(II).

(a) Reduction of nitrate by the nitrate reductase enzyme via OAT; (b) reduction of nitrite by the nitrite reductase enzyme using H+/e−; (c) reduction of nitrate to nitric oxide via nitrite by thiols at copper(II).