tracheal beta 2-adrenoceptors contribute 99 % , 97 % and 7 % , sinoatrial beta 2-adrenoceptors contribute 76 % , 3 % and 0 % to the fractional stimuli induced by ( +/- ) -fenoterol , ( - ) -adrenaline and ( - ) -noradrenaline , respectively .
C0014563
adrenaline
C0028351
noradrenaline