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(A) Hoogsteen hydrogen bonded guanine quartet. (B) Crystal structure of d(G4T4G4) (Oxy1.5) incorporating guanine quartets (11). (C) Solution structure of Oxy1.5 incorporating guanine quartets (12). (D) Hairpin structure of d(T4G4)2 (Oxy2) incorporating G·G pairs (10). (E) Parallel-stranded quadruplex structure of Oxy2 (9).
