Animals Article Brain CD11b antigen CD3+ T lymphocyte CD4+ T lymphocyte CD8+ T lymphocyte Cell Movement Diet Disease Models, Animal Female Institute for Cancer Research mouse Macrophages Male Mice, Inbred ICR Pain, Postoperative Spinal Cord T lymphocyte T-Lymphocytes animal animal cell animal experiment animal model animal tissue brain cell count cell infiltration cell motion central nervous system chow diet