The absence of ACKR1 from erythrocytes also appears to cause benign ethnic neutropenia 165, 171, 172 and may influence HIV infection by leading to CCR5 ligand dysregulation or loss of ACKR1‐mediated HIV presentation 173, 174, although this was not borne out in other studies 175, 176, 177, 178. This evidence concerns the gene ACKR1 and neutropenia.