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Effect of tetrapentylammonium (TPeA) on quercetin-induced Isc in a mucosal sheet of rat distal colon after apical permeabilization with nystatin. TPeA (T, 100 μM) was applied at the time indicated to the serosal side; the control tissue received only vehicle. Quercetin (Q, 100 μM serosal) was added at the time indicated to both the control tissue and the TPeA-pretreated tissue.
