renal vasoconstrictor responses to renal nerve stimulation and alpha 1-adrenergic receptor agonists ( norepinephrine , phenylephrine ) were inhibited by an alpha 1-adrenergic receptor antagonist ( prazosin ) but not by an alpha 2-adrenergic receptor antagonist ( rauwolscine ) .
C1373109
alpha
C0031469
phenylephrine