1S00:
reference: X-Ray structure determination of three mutants of the bacterial photosynthetic reaction centers from Rb. sphaeroides; altered proton transfer pathways., Xu Q, Axelrod HL, Abresch EC, Paddock ML, Okamura MY, Feher G, Structure (Camb) 2004 Apr;12(4):703-15. PMID: 15062092

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