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UPLC/MS2 analysis of PhIP and MeIQx metabolites in urine (A) before and (B) during semi-controlled meat feeding study. The peak detected at tR 9.4 min with the transition of 214.1 > 199.1 is 2-amino-1,7-dimethylimidazo[4,5-g]quinoxaline, an isomer of MeIQx.78 HON-PhIP-N2-Gl elutes at tR 21.10 min and HON-PhIP-N3-Gl elutes at tR 14.59 min.
