2WX5:
reference: Structural and spectroscopic consequences of hexa-coordination of a bacteriochlorophyll cofactor in the Rhodobacter sphaeroides reaction center., Frolov D, Marsh M, Crouch LI, Fyfe PK, Robert B, van Grondelle R, Hadfield A, Jones MR, Biochemistry. 2010 Jan 29. PMID: 20112981

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