1.12.1.4	bifurcating [FeFe] hydrogenase, electron-bifurcating ferredoxin- and NAD-dependent hydrogenase, Fe-only hydrogenase, HydABC, HydC, HydF, iron hydrogenase, NAD(P)+-linked [FeFe]-hydrogenase, [FeFe]-hydrogenase, [FeFe]-type hydrogenase