CCR8 and bronchiolitis obliterans syndrome: Interestingly, the BO CU group showed higher expression of CCX-CKR (flow value: 4.7 ± 3.8) and CCR8 (1.9 ± 1.9) in comparison to healthy subjects (CCX-CKR–1.9 ± 1.9; CCR8–1.8 ± 0.8) (Figure 2A,D).