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UPLC-MS/MS chromatograms (TIC) of: (a) naturally contaminated gonads ample from L. sceleratus pufferfish; and (b) the certified tetrodotoxins (TTXs) reference standard (TTX = 2000 ng/mL; 4-epiTTX = 49.86 ng/mL; 4,9-anhydroTTX = 467.4 ng/mL). Peak scale has been adjusted in some of the chromatograms to allow presentation of lower concentration peaks.
