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Short circuit current (Isc) responses of T84 cells to cholera toxin (CT 0.0001 to 0.1 μg/ml) over 180 minutes. CT was applied to the apical surface unless otherwise indicated, when it was applied to the basolateral surface (B). Isc is expressed as change in current/cm2 of monolayer. Data are means (SEM) (n = 5).
