C5AR1 and leukemia: CXCR1-transfected and C5aR-transfected mouse leukaemia L1/2 BCs in response to CXCL8 and C5a, respectively (21); CCR4-transfected and CXCR2-transfected HEK-293 cells in response to CCL17 and CXCL8, respectively (22, 26) (Table 1).