in another series of experiments , rauwolscine ( 10 ( -6 ) m ) strongly antagonized the response to xylazine ( alpha 2-selective agonist ) , antagonized the responses to alpha-methylnoradrenaline and noradrenaline ( mixed agonists ) less strongly , and did not affect the response to phenylephrine , conversely , prazosin ( alpha 1-selective antagonist , 10 ( -8 ) m ) strongly antagonized phenylephrine , antagonized noradrenaline and alpha-methylnoradrenaline less strongly , and did not antagonize xylazine .
C0028351
noradrenaline
C0025805
alpha-methylnoradrenaline