Fig. 7
A Representative examples of the confocal images showing catecholamine-positive fibers in the left atria appendage (a) and left atria wall (b), PV mouth (d), in proximal (e) and distal sites of the pulmonary veins (f, as shown in the top left inset) of BALB/c mice. c, g expanded scale of b and f. B The presence of the sympathetic nerves in the atria and pulmonary veins of BALB/c mice. An area of the catecholamine-derived fluorescence (a) and a length of the catecholamine-positive fibers (b) related to the total area of the images. LAA left atria appendage, PV-m PV mouth, PV pulmonary vein. * p < 0.05