1FRD:
reference: Molecular structure of the oxidized, recombinant, heterocyst [2Fe-2S] ferredoxin from Anabaena 7120 determined to 1.7-A resolution., Jacobson BL, Chae YK, Markley JL, Rayment I, Holden HM, Biochemistry 1993 Jul 6;32(26):6788-93. PMID: 8329401

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