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Cytotoxicity in Caco-2 cells after 24 h exposure to okadaic acid (OA), dinophysistoxin-1 (DTX-1), and dinophysistoxin-2 (DTX-2). Cytotoxicity was measured by the neutral red uptake assay. Four independent experiments were performed. (A) Viability values are presented as means ± SEM and expressed as percentages of the vehicle control. (B) IC50 values are presented as box plot. a, b: box plot without a common letter differ (p < 0.05).
