1H2R:
reference: Removal of the bridging ligand atom at the Ni-Fe active site of [NiFe] hydrogenase upon reduction with H2, as revealed by X-ray structure analysis at 1.4 A resolution., Higuchi Y, Ogata H, Miki K, Yasuoka N, Yagi T, Structure Fold Des 1999 May;7(5):549-56. PMID: 10378274

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