Lumbar spinal cords were collected from naïve WT BALB/c, CD40 KO, and CD4 KO mice and the RNA expression of chemokines, CCL2 (A), CCL3 (B), CCL5 (C), and CXCL1 (D) in the lumbar spinal cords were determined via real-time qRT-PCR using GAPDH as control. Data are presented as mean ± SEM (n = 4 for all). * p < 0.05 compared to all other genotypes of mice, and # p < 0.05 compared to WT mice.