T cell receptor (TCR)

T cell receptors (TCRs) are specialized proteins found on the surface of T cells, a type of white blood cell crucial for the immune system. They act like antennas that help T cells recognize and bind to specific pieces of foreign substances, called antigens, presented by other immune cells. Once a TCR attaches to its target, it triggers the T cell to respond, either by attacking infected cells or coordinating the immune response. This recognition is essential for the body to defend itself against infections and diseases, including cancer.