Objective:To explore the changes of brain-derived neurotrophic factor (BDNF)and neural cell adhesion molecule (NCAM) proteins expression in hippocampus of rats induced by electromagnetic radiation. Methods: Wistar rats were exposured under 6×104V/m electromagnetic pulse and the expression of BDNF and NCAM proteins in hippocampus were detected with immunohistochemistry staining. Results: BDNF and NCAM proteins expression all rose lh after exposure and reached the highest level at 6h after exposure (P<0. 05)....