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Electron capture-negative chemical ionization GC/MS analysis of the ethyl heptafluorobutyrate, MtBSTFA derivatives of 3-bromotyrosine and 3-chlorotyrosine in peritoneal inflammatory fluid of a wild-type mouse subjected to CLP. Note the simultaneous monitoring of endogenous (m/z 489; a), isotope-labeled (m/z 495; b), and artifactual (m/z 499; c) 3-chlorotyrosine (3-Cl-Tyr) and 3-bromotyrosine (3-Br-Tyr).
