3V3Z:
reference: The site-directed mutation I(L177)H in Rhodobacter sphaeroides reaction center affects coordination of P(A) and B(B) bacteriochlorophylls., Vasilieva LG, Fufina TY, Gabdulkhakov AG, Leonova MM, Khatypov RA, Shuvalov VA, Biochim Biophys Acta. 2012 Feb 15. PMID: 22365928

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