<unk>  (English: "The Conduction System of the Mammalian Heart") is a scientific monograph published in 1906 by Sunao Tawara. It has been recognized by cardiologists as a monumental discovery, and a milestone in cardiac electrophysiology". The monograph revealed the existence of the atrioventricular node and the function of Purkinje cells. It was used by Arthur Keith and Martin Flack as a detailed guide in their attempts to verify the existence of the Bundle of His, which subsequently led to their discovery of the sinoatrial node. Throughout the beginning of the 20th century, Tawara's monograph influenced the work of many cardiologists and it was later cited by Willem Einthoven in his anatomical interpretation of the electrocardiogram.
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