in the cerebellum the potency order was ( +/- ) protokylol greater than ( +/- ) hydroxybenzylisoproterenol greater than ( +/- ) isoproterenol greater than ( - ) epinephrine greater than ( +/- ) salbutamol greater than ( - ) norepinephrine , indicating the presence of a beta 2-adrenergic receptor .
C0014563
epinephrine
C0028351
norepinephrine