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 (PubMed:7568052, PubMed:8574847). Binds to CCR3 (By similarity). Expressed constitutively in the thymus. Expression inducible in the lung (type I alveolar epithelial cells), intestine, heart, spleen, kidney. By interferon gamma and lipopolysaccharides (LPS) (PubMed:7568052). By interleukin-13 (IL13) (PubMed:15647285). Belongs to the intercrine beta (chemokine CC) family.