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Product ion spectra of (a) m/z 320.1 of TTX standard, (b) m/z 320.1 of TTX in sample extract (Cl-3, viscera), (c) m/z 318.1 of TTX analogue in sample extract (Cl-3, viscera), and (d) m/z 302.1 of 4,9-anhydro TTX in sample extract (Cl-3, viscera).
