ACKR1 and breast cancer: The screening results showed that none of the receptors for Cx3cl1 (CX3CR1), Cxcl16 (CXCR6), Ccl17 (CCR4, DARC, CCR10) or IL6 (IL6R) was more expressed in basal B compared to basal A or luminal breast cancer cells (Supplementary Fig. S4A-F).