1JS2:
reference: Crystal structure and stability studies of C77S HiPIP: a serine ligated [4Fe-4S] cluster., Mansy SS, Xiong Y, Hemann C, Hille R, Sundaralingam M, Cowan JA, Biochemistry 2002 Jan 29;41(4):1195-201. PMID: 11802718

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