CCR6 and glioblastoma: Following identification of T-cell subsets (Figure 2), expression of CCR2, CCR4, CCR5, CCR6, CXCR3, CXCR4, CXCR6, and CX3CR1 was investigated on glioblastoma and blood CD4+ (Figure 3) and CD8+ (Figure 4) T-cell subsets.