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Figure 3 Section from the area beneath the endocardial site where the microelectrode from Fig. 2 was impaled. The section was cut perpendicular to the tricuspid valve annulus. The arrow indicates the insertion site. The area consists of strands of myocardial cells widely separated by connective tissue (light areas). Most cells are deprived of cross striation, indicative of transitional cells. A = atrium; E = endocardium; V = ventricle. Scale 0.5 mm.
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