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Effects of neurotensin in the absence or presence of 100 nM apamin on membrane potential of longitudinal smooth muscle cell of the ileum. (A) Exogenously added neurotensin at 1 μM induced slow hyperpolarization. (B) Inhibition of NT-induced hyperpolarization by apamin (100 nM). Lines indicate the presence of drugs. Apamin was added 10 min before NT-treatment. Records in (A) and (B) were from the same longitudinal muscle cell.
