NGF and myocardial infarction: Immunofluorescence detection of NGF-positive signals in cardiac macrophages (NGF/F4/80+ cells) in the peri-infarct zone of each group of mice showed a significant increase in NGF/F4/80+ cells in the MI group compared to the Sham group, while NGF-positive expression was reduced in mice treated with EA (Figures 7(f) and 7(g)).