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In the region of the atrioventricular node a characteristic cell potential was obtained by microelectrode recording in dogs. The resting and action potentials obtained here were small and the latter had a step-like potential before the steepest rise. The site of origin was examined histologically by a special staining technic and was found to be from a cell of the atrioventricular node or a part of the special junctional tissue adjacent to it.

Histologic Examination of the Origin of the Action Potential Characteristically Obtained from the Region Bordering the Atrioventricular Node