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(A) High-performance liquid chromatography with tandem mass spectrometry (HPLC-MS/MS) chromatograms of tetrodotoxin (TTX) standard and Bacillus sp. 1839 spore culture extract; (B) MS/MS spectra of TTX standard and Bacillus sp. 1839 spore culture extract. As a standard for TTX, a commercial TTX solution was used (CTTX = 1 ng/mL).
