Enzyme Nomenclature. Recommendations
EC 1.18.1 With NAD+ or NADP+ as acceptor
EC 1.18.2 With dinitrogen as acceptor (transferred to EC 1.18.6)
EC 1.18.3 With H+ as acceptor
EC 1.18.6 With dinitrogen as acceptor
EC 1.18.96 With other, known, physiological acceptors
EC 1.18.99 With H+ as acceptor