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Experimental design. (A) The stacked-X Holliday junction, from Protein Data Bank ID 3GOM. Ba2+ cation sites shown in gold, occupancies between 0.4 and 0.3. (B) Chemical formula of 1, Λ-dipyrido[3,2-a:2′,3′-c]phenazine-bis(1,4,5,8-tetraazaphenanthrene)-ruthenium(II).
