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LC-MS/MS chromatograms obtained for (A) a mix of P-CTX standards (provided by Institut Louis Malardé) and Solid Phase Extraction-purified extracts of Tectus niloticus collected from Anaho Bay in (B) July 2014, (C) December 2014 and (D) November 2016. Chromatograms were acquired following the procedure described in Section 4.5, in positive multi-reaction monitoring (MRM) mode.
