the relative order of potency for the agonists at postjunctional alpha 1-adrenoreceptors mediating contraction of smooth muscle in epididymal segments of the vas deferens was : ( - ) -adrenaline greater than or equal to ( - ) -noradrenaline greater than phenylephrine greater than clonidine greater than or equal to ( + ) -adrenaline greater than or equal to methoxamine greater than or equal to ( + ) -noradrenaline greater than or equal to metaraminol greater than or equal to dopamine greater than or equal to ( - ) -isoprenaline greater than or equal to xylazine ;
C0014563
adrenaline
C0028351
noradrenaline