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Schematic diagrams and molecular structures of three base-intercalated duplexes, found in G1-I-lowK (a), in G1-I-highK (b) and in G1-Br-highK (c). The two ends of the duplex are largely bent in (a) to form G-quartets in the central part, indicating that the four base-intercalated duplexes are tightly bound to form an octaplex. Those of the split quadruplex seem to be relaxed, as compared with (a).
