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(A) Structures of G.TA, C+.GC and T.AT triads (11,27). (B) Base sequence and folded conformation of the GTA triplex investigated (11). (C) Base sequence and folded conformation of the C+GC triplex investigated (24). (B and C) Watson–Crick hydrogen bonds are indicated by vertical bars, Hoogsteen hydrogen bonds are indicated by asterisks, and the bases containing hydrogen-bonded imino protons are shown in bold.
