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The levels of 2-amino-9H-pyrido[2,3-b]indole (AαC or 2-amino-α-carboline), 2-amino-3-methyl-9H-pyrido[2,3-b]indole (MeAαC or 2-amino-3-methyl-α-carboline), 9H-pyrido[3,4-b]indole (norharman), and 1-methyl-pyrido[3,4-b]indole (harman) have been determined in the mainstream smoke condensate from three reference cigarettes, namely Kentucky reference 1R5F, Kentucky reference 2R4F, and CORESTA CM4. The...