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LC-MS detection of Trp metabolites produced by MCF-7 cells. Mass spectrum (LC-MS, positive mode) of (A) Trp (m/z 204.09), (B) N-formylkynurenine (m/z 236.08), (C) kynurenine (m/z 208.08), (D) kynurenic acid (m/z 189.04), (E) xanthurenic acid (m/z 205.04), (F) 3-hydroxykynurenine (m/z 224.08), (G) anthranilic acid (m/z 137.05) and (H) quinolinic acid (m/z 167.02) in MCF-7 cells.
