Conductance changes in the mesenteric bed in response to bolus applications of acetylcholine (ACh, 3 nmol kg−1), bradykinin (BK, 0.3 nmol kg−1), and sodium nitroprusside (SNP, 3 nmol kg−1) in the control period and following administration of l-NAME plus indomethacin (Indo), then iberiotoxin (IbTx), and finally charybdotoxin (ChTx) plus apamin. * Significantly different from control.