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Figure 2: Photomicrograph from the microscopic location of the Purkinje fibers in endocardium, that showing the layers, Green Masson’s Trichrome. Arrow—endothelium cells, SE—subendothelium layer, SA—subendocardial, P—Purkinje cell, *—connective tissue sheath, M—myocardial cells, L—lipofuscin pigment.