Portela, A Apparent dissociation constants between choline and the frog muscle membrane receptor. [electronic resource] - Acta physiologica latino americana 1968 - 253-6 p. digital Publication Type: Journal Article ISSN: 0001-6764 Subjects--Topical Terms: Acetylcholine--physiologyAnimalsAnuraBinding SitesCesium--pharmacologyCholine--pharmacologyMembrane PotentialsMuscles--physiologyPotassium--pharmacology