ACKR1 (Atypical Chemokine Receptor 1): ACKR1 is a receptor that binds chemokines without initiating a signal, functioning as a decoy to regulate the immune response. Previously known as the Duffy antigen receptor for chemokines (DARC), ACKR1 affects leukocyte migration by capturing chemokines. It also plays a crucial role in malaria resistance by acting as a receptor for Plasmodium vivax. Variations in ACKR1 can influence susceptibility to infections and autoimmune diseases, highlighting its significance in immunity and disease.