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Figure 8 Histologic findings corresponding to activations shown in Figure 5. Panels A, C and D show sections of the subepicardial myocardium from the left ventricle of heart no. 5. With trichrome stain, significant interstitial fibrosis (blue area) was demonstrated in panel C. The area of fibrosis corresponded to the line of conduction block in panel B (same frame as Fig. 5C). In the areas without conduction block, however, histologic examination showed less fibrous tissue (panels A and D). Original magnification 10x, panels A, C and D. Calibration lines 1 mm.
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