1FNP:
reference: X-ray structure analyses of photosynthetic reaction center variants from Rhodobacter sphaeroides: structural changes induced by point mutations at position L209 modulate electron and proton transfer., Kuglstatter A, Ermler U, Michel H, Baciou L, Fritzsch G, Biochemistry 2001 Apr 10;40(14):4253-60. PMID: 11284681

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