a marked selectivity of urotensin i for alpha-1 adrenoceptor-mediated responses was observed : ic30 values of the peptide for pressor responses to phenylephrine , norepinephrine and alpha-methylnorepinephrine were 0.05 , 0.83 and greater than 6 nmol/kg , respectively .
C0028351
norepinephrine
C0025805
alpha-methylnorepinephrine