To assess the effects of NPC transplantation on macrophage differentiation in chronic stages of the injury (i.e., 8 weeks after SCI), spinal cord sections were stained for Iba1, a marker for macrophages, iNOS, a marker for pro-inflammatory M1 macrophages, and CD206, a marker for anti-inflammatory M2 macrophages (control group, n = 6; NPC group, n = 7). The gene discussed is NOS2; the disease is nasopharyngeal carcinoma.