CD3 complex

The CD3 complex is a group of proteins found on the surface of T cells, a type of immune cell. It plays a crucial role in helping T cells recognize and respond to infected or abnormal cells. When a T cell encounters its target, the CD3 complex transmits signals from the T cell receptor, activating the T cell to attack the threat. Essentially, CD3 is like a signal transmitter that helps T cells identify when they need to act, making it vital for the immune response.