The spleen lymphocyte electrophoretic mobility was used as an indicator for determining the effect of vitamin E (VE) oa protecting the spleen lymphocyte membrane from irradiation injury. The result demonstrated that after whole body irradiation of mice with 4.8 Gy X-ray, the spleen lymphocyte electrophoretic mobility (SL-EPM) of the animals administered 100ppm VE for six weeks was significantly higher than that of the control (p