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The SIM LC/MS chromatogram for [M+Na]+ of ciguatoxins (CTXs) obtained from the red snapper implicated in CFP in Vietnam: (a) Authentic CTX-1B; (b) CTX-1B in red snapper; (c) 52-epi-54-deoxy CTX-1B and 54-deoxy CTX-1B in red snapper. Rt: Retention time.
