3FWY:
reference: Crystal Structure of the L Protein of Rhodobacter sphaeroides Light-Independent Protochlorophyllide Reductase with MgADP Bound: A Homologue of the Nitrogenase Fe Protein., Sarma R, Barney BM, Hamilton TL, Jones A, Seefeldt LC, Peters JW, Biochemistry. 2008 Nov 12. PMID: 19006326

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