the adrenoceptor affinities , expressed as agonist concentrations for 50 % response ( ec50 ) , were 1.3 x 10 ( -8 ) and 7.6 x 10 ( -7 ) mol l-1 for noradrenaline and adrenaline , respectively .
C0028351
noradrenaline
C0014563
adrenaline