antigen receptors

Antigen receptors are specialized proteins on the surface of immune cells, such as B cells and T cells, that identify and bind to specific foreign substances called antigens (like parts of bacteria or viruses). This binding allows the immune cells to recognize specific threats and initiate a targeted immune response. Each receptor is unique, like a lock designed to fit a particular key (antigen). This specificity enables the immune system to efficiently detect and combat a wide range of pathogens, playing a crucial role in defending the body against infections.