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Definition: Collective name for a series of proteins in the blood. Proteins of the complement series are activated by antibody bound to invading organisms and lead to rupture of foreign cells. Some complement proteins also bind to antibody-antigen complexes enhancing phagocytosis by phagocytic cells of the immune system.
Source: Hickman, C.P., et al. 2011. Integrated Principles of Zoology. Fifteenth Edition. McGraw-Hill Higher Education.