3H4O OXIDOREDUCTASE, YP_001089872.1, NITROREDUCTASE FAMILY PROTEIN, STRUCTURAL GENOMICS, JOINT CENTER FOR STRUCTURAL GENOMICS, JCSG, PROTEIN STRUCTURE INITIATIVE, PSI-2 CRYSTAL STRUCTURE OF NITROREDUCTASE FAMILY PROTEIN (YP_001089872.1) FROM CLOSTRIDIUM DIFFICILE 630 AT 1.50 A RESOLUTION