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[Endogenous ouabain-like substances in animal tissues].

Methods of purification and properties of the digitalis-like substances from different animal-origin sources are considered. Possible mechanisms of the cardiac glycoside-effect on the cardiac muscle and endogenous digitalis-like factors' effect on the smooth muscles of the blood vessels are discussed. Criteria that may be used to characterize the digitalis-like activity in samples and extracts obtained from different tissues are presented. The role of these substances in some types of pathologies, especially in the development of hypertension, is considered.