The following reactions are all antigen(Ag)-antibody(Ab) complexes. Match the description with the best reaction. Use each option only once. 1. Antibodies react with soluble antigens and when they do, a complex forms that comes out of solution (e.g. is now insoluble). 2. Reaction with insoluble antigens (a particle such as a cell with an antigen), rather than a soluble antigen. 3. Antibodies coat antigens and enhances phagocytosis 4. Antibodies with their antigen involve the complement proteins; can cause the invading organism to lyse Answer choices to MATCH with the above sentences are: -Agglutination -Precipitin -Complement Fixation -Opsonization

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