[High and low affinity beta adrenergic receptor sites from submandibular glands of mice]

Beta-adrenergic receptors from submandibular glands of mice were studied by equilibrium binding experiments. Due to the fact that some discrepancies were previously observed among different author data, we compared two methods for non specific binding substruction, that represents the major source of errors in such experiments. Data were obtained strongly suggesting the presence of multiple population of binding sites and/or negative cooperativity.