1QX8:
reference: Loopless Rop: structure and dynamics of an engineered homotetrameric variant of the repressor of primer protein., Glykos NM, Papanikolau Y, Vlassi M, Kotsifaki D, Cesareni G, Kokkinidis M, Biochemistry. 2006 Sep 12;45(36):10905-19. PMID: 16953576

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