1VRN:
reference: Cryogenic structure of the photosynthetic reaction center of Blastochloris viridis in the light and dark., Baxter RH, Seagle BL, Ponomarenko N, Norris JR, Acta Crystallogr D Biol Crystallogr. 2005 May;61(Pt 5):605-12. Epub 2005, Apr 20. PMID: 15858271

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