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The classical pathway of complement activation is an essential part of the immune response, particularly in defending the body against infections. This pathway is triggered by the recognition of pathogens or antigen-antibody complexes, and it plays a key role in the elimination of these threats through various mechanisms like opsonization, inflammation, and cell lysis. The pathway is highly specific and involves a series of protein interactions and enzymatic activations. The classical pathway begins with the formation of the antigen-antibody complex. When an antigen, such as a pathogen, is __________ _________ _________ _______ _____ _____ ____ _____ _______.
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