 Interleukin 5 has been shown to interact with Interleukin 5 receptor alpha subunit.The IL-5 receptor is composed of an α and a βc chain.The α subunit is specific for the IL-5 molecule, whereas the βc subunit also recognised by interleukin 3 (IL3) and granulocyte-macrophage colony-stimulating factor (GM-CSF).