Figure 2

Histopathological analysis of skeletal muscle of mice untreated or treated by caliper or needle electrodes. Panel A: cross-section of normal skeletal muscle from an untreated mouse (original magnification ×20); Panel B: cross-section of skeletal muscle from a mouse treated by caliper electrodes showing a focus of mild mononuclear inflammation, indicated by an asterisk (original magnification ×20); Panel C: cross-section of skeletal muscle from a mouse treated by needle electrodes displaying a more severe mononuclear inflammation with necrosis and phagocytosis of muscle fibers, indicated by an asterisk (original magnification ×20).