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Representative UPLC-ESI/MS3 chromatograms of AαC and MeIQ DNA adducts and internal standards (ISTDs) in liver and colon of (A) untreated mice and (B) mice treated with carcinogens for 4 weeks. In the negative control sample (a, c, k), the intensities of the signals were normalized to the same scale as the ISTD (b, d, l). The area (A) and retention time (tR) are reported.
