An antigen-antibody complex is formed when an antibody binds to an antigen. This complex plays a crucial role in the immune system by initiating immune responses. The binding of the antibody to the antigen helps to neutralize pathogens or mark them for destruction by other immune cells. The antigen-antibody complex is also referred to as an immune complex. It can trigger various immune mechanisms, such as phagocytosis (the engulfment of pathogens by immune cells) or activation of the complement system, which helps fight infections.

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