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Typical chromatogram obtained upon analysis by gas chromatography-nitrosamine selective detection of urine from a child in this study. Arrow: retention time of silylated iso-NNAL. Peaks with arrows correspond to NNAL and two internal standards (I.S.) used in the analysis, C5NNAL and N-nitrosopentyl-3-picolylamine (NPPA). Gas chromatography conditions are slightly different from those used for Figure 3.
