1YF6:
reference: Quinone (Q(B)) Reduction by B-Branch Electron Transfer in Mutant Bacterial Reaction Centers from Rhodobacter sphaeroides: Quantum Efficiency and X-ray Structure(,)., Paddock ML, Chang C, Xu Q, Abresch EC, Axelrod HL, Feher G, Okamura MY, Biochemistry 2005 May 10;44(18):6920-8. PMID: 15865437

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