1UPX:
reference: Structure of the hybrid cluster protein (HCP) from Desulfovibrio desulfuricans ATCC 27774 containing molecules in the oxidized and reduced states., Macedo S, Aragao D, Mitchell EP, Lindley P, Acta Crystallogr D Biol Crystallogr 2003 Dec;59(Pt 12):2065-71. PMID: 14646063

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