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The noradrenaline overflow in perfusate induced by periarterial nerve stimulation (PNS). PNS at 4, 8, 12, and 16 Hz was applied to isolated mesenteric vascular beds with an intestinal tract in the absence (Control) or presence of 30 nmol/l prazosin (Prazosin) or 1 µmol/l naloxone (Naloxone). Data are shown as the mean ± S.E.M. of five rats.
