C4

C4 refers to a specific part of our immune system, involving white blood cells called T cells, that helps recognize and attack infected or abnormal cells. It is also known as "Class 4" in some communication systems, like the complement system, which enhances the body's ability to fight pathogens. In the immune response, C4 plays a role in activating other parts of the immune system, leading to the destruction of harmful microbes or diseased cells. Essentially, it is a crucial component that helps coordinate the body's defense mechanism against infections.