1.17.98.4	crystals diffract to 2.6 A resolution and belong to a space group of P4(1)2(1)2 or P4(3)2(1)2 with unit cell dimensions a = b = 146.1 A and c = 82.7 A. There is one monomer of FDH per crystallographic asymmetric unit. Similar diffraction quality crystals of oxidized FDH can be obtained by oxidation of crystals of formate-reduced enzyme with benzyl viologen. Mo(IV)- and the reduced FeS cluster containing form of the enzyme was crystallized and this can be converted into Mo(VI)- and oxidized FeS cluster form upon oxidation	
1.17.98.4	reinterpretation of the crystal structure