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Figure 7 Histological Studies

(A and B) Masson's trichrome stain of sinus node and right atrium, respectively. There was increased fibrosis (blue) in these tissues. The objective was 4x, and the calibration bar is 1 mm. (C and D) TH and ChAT staining, respectively, of the vagal nerves. Arrows point to positively stained structures in brown color. The objective was 10x, and the calibration bar is 0.1 mm.