IL1RL1 (Interleukin 1 Receptor Like 1): IL1RL1 is a receptor for interleukin-33 (IL-33), a cytokine involved in inflammation and allergic reactions. Also known as ST2, IL1RL1 mediates the effects of IL-33 in the immune system and plays a crucial role in conditions such as asthma, atopic dermatitis, and other allergic diseases. Its role in the IL-33 signalling pathway makes it a potential target for therapies aimed at treating allergic and inflammatory disorders.