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Schematic drawing showing the regions of the rat atrioventricular junction (AVJ). Also shown is the transitional cell layer. CS (coronary sinus), CFB (Central fibrous body) INE (Inferior nodal extension), CN (Compact node), Proximal penetrating bundle (PPB), Distal penetrating bundle (DPB), IVC (Inferior Vena cava), FO (Foramen ovale), TV (Tricuspid Valve).
