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protein receptor involved in immune response and inflammation

GPR44, also known as CRTH2 or the DP2 receptor, is a type of protein found on the surface of certain cells that plays a role in the body's immune response. It is involved in the process of inflammation and allergic reactions by binding to prostaglandin D2, a molecule that can cause symptoms like itching, swelling, and redness. This receptor is also being studied for its potential role in conditions like asthma and alopecia, where it may influence hair growth and immune system activity.