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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 recognized by antibodies (usually IgG or IgM), these antibodies bind to the antigen. This binding exposes a binding site on the Fc region of the antibody, which is recognized by the first component of the classical pathway, C1. C1 is a complex composed of _____ _______ ____ ________ __________ _______ __________ ___.
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