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Time course of secretion induced by LTIIa applied apically or basolaterally and CT applied apically in cultured polarized human epithelial T84 cells. Short circuit current (Isc) is plotted against minutes at 37°C; note that the Isc scale is both broken and expanded to clearly display all data sets on the same graph. Bars indicate SD. Results are from a typical experiment, n = 2.
