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Effect of tetrapentylammonium (TPeA) on quercetin-induced Isc in rat distal colon. TPeA (T, 100 μM) or vehicle were applied at the time indicated to the serosal side. Quercetin (Q, 100 μM serosal) was added at the time indicated to both the control group (n=7) and to the TPeA-pretreated group (n=7).
