IL5RA (Interleukin 5 Receptor Alpha): IL5RA is a component of the receptor for interleukin 5, a cytokine involved in the growth and differentiation of eosinophils. It plays a vital role in immune responses, particularly in allergic reactions and asthma, where eosinophils function as key effector cells. Targeting IL5RA is a therapeutic strategy for diseases characterised by eosinophilia, offering potential treatments for severe asthma and other eosinophil-related disorders.