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LC-MS/MS profile of endogenous δ-Cys-NO2-CLA addition products in human urine. Comparison of isotopically labeled standards generated from the δ-addition of cysteine to 9-NO2-CLA (A), 12-NO2-CLA (B), a 1:1 mixture of both standards (C), and urine Cys-NO2-CLA (D). Data were obtained from a single urine donor with LC-MS/MS profiles consistent with published reports (1, 2).
