because the paraventricular hypothalamic nucleus ( pvn ) plays a central role in autonomic and cardiovascular regulation , we administered the mu-selective enkephalin analog , d-ala2-nme-phe4-gly ( ol ) 5enkephalin ( dago ) , directly into pvn in conscious , unstressed rats and determined the changes in plasma catecholamine concentrations , blood pressure and heart rate .
C0014298
enkephalin
C0525773
dago