In response to the presence of allergens, this protein directly promotes the accumulation of eosinophils (a prominent feature of allergic inflammatory reactions), but not lymphocytes, macrophages or neutrophils (Probable). Attracts eosinophils in vitro but is not responsible for eosinophilia in the ovary (PubMed:15916812). Binds to CCR3 (By similarity). Belongs to the intercrine beta (chemokine CC) family.