The T-cell receptor (TCR) is a protein complex found on the surface of T cells, a type of white blood cell that plays a crucial role in the immune system. TCRs are responsible for recognizing specific antigens, or foreign substances, and triggering an immune response to eliminate them. Research in the area of T-cell receptors focuses on understanding how these receptors interact with antigens, how they are involved in immune responses, and how they can be harnessed for potential therapies, such as in cancer immunotherapy. Studying TCRs is important for gaining insights into the immune system and developing novel approaches to treat various diseases.