Interleukin 4 cytokine molecules, illustration - stock illustration

Interleukin 4 cytokine molecules, illustration. Interleukin 4 (IL-4) is a key regulator of the immune system and plays an important role in the development of allergic hypersensitivity, exacerbating allergic and asthmatic symptoms. Interleukin 4 is a peptide with 125 amino acids.