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