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Ameliorative action of ondansetron (Ond; 1 mg·kg−1) on gastrointestinal transit in a mouse model of POI. Data shown are means ± SEM of ratio (%) of Phenol Red content (A–C). Geometric centre calculated from A to C (D). **P < 0.01; significantly different from control. ##P < 0.01; significantly different from POI. Data shown are means ± SEM from four independent experiments.
