Fe(III)-[cytochrome c] + H2O + nitric oxide = Fe(II)-[cytochrome c] + 2 H(+) + nitrite A + H2O + NH4(+) = AH2 + H(+) + hydroxylamine Binds 1 heme c group covalently per subunit. Binds 1 heme d1 group per subunit. Homodimer in solution. By anaerobic conditions. Induced by nitrite, repressed by nitrate, and inhibited by oxygen.