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(A) Superposition of five structures of the major conformer of the [PhIP]dG⋅dC 11-mer adduct duplex. Views of the central 3-bp segment of the best structure looking (B) into the major groove and normal to the helix axis and (C) down the helix axis with the modified [PhIP]G6⋅C17 in gray and the PhIP in black.
