B-Cell Receptor
A B-cell receptor (BCR) is a protein complex found on the surface of B cells, a type of white blood cell involved in the immune response. BCRs are responsible for recognizing specific antigens, which are foreign substances like bacteria or viruses. When a BCR binds to its corresponding antigen, it triggers the B cell to activate and proliferate, leading to the production of antibodies.
Antibodies are proteins that help neutralize or eliminate pathogens. Each BCR is unique, allowing the immune system to target a wide variety of antigens. This diversity is crucial for effective immune defense, as it enables the body to respond to numerous infections and diseases.