CD4 and acute lymphoblastic leukemia: Flow cytometry analyses and immunoblotting of primary T-ALL samples (n ≤ 15), further confirmed differential CXCR3 levels in T-ALL cells compared with human CD34+ progenitors (n = 2) and mature CD4+ (n = 5) and CD8+ cells (n = 5), which had lower CXCR3 expression (Figure 1, J and K, Supplemental Figure 1J, and Supplemental Table 1).