1K66:
reference: Crystal structures of two cyanobacterial response regulators in apo- and phosphorylated form reveal a novel dimerization motif of phytochrome-associated response regulators., Benda C, Scheufler C, Tandeau de Marsac N, Gartner W, Biophys J 2004 Jul;87(1):476-87. PMID: 15240481

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