Saturation and inhibition binding studies, using [H-3]CGP-12177 as radioligand, reveal the presence of a single class of beta-adrenoceptors on intact bovine mononuclear leukocytes. Receptor binding is inhibited by beta-adrenergic agonists with a rank order of potency (-)-isoproterenol > (-)-epinephrine > (-)-norepinephrine, indicating that the rece...