1.8.4.8	Fe	iron-sulfur protein, each mole of protein contains 3.3 mol of Fe	712502	
1.8.4.8	Iron	the enzyme contains a [4Fe-4S] cluster per subunit, absolutely required for activity, constitution is altered in presence of oxygen, activity is restored after decomposition and reassembly	659441	
1.8.4.8	additional information	enzyme contains no iron	393953