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Mass chromatograms of the LC-MS/MS obtained under MRM mode (m/z 320 > 302). MRM patterns of the extract from specimen S1 (A), the extract from specimen S2 (B), and 25 ng/mL TTX standard (C). The MRM patterns were obtained from S1 and S2, with 1000- and 10,000-fold dilution, respectively.
