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Complement is a system of plasma proteins that may be triggered directly by pathogens or indirectly by pathogen-bound antibodies, resulting in a cascade of events on pathogen surfaces that yield active components with varied effector roles.
What exactly is complement?
The complement system aids or "complements" antibodies and phagocytic cells in their capacity to eliminate infections from an organism. It's a component of the innate immune system. The complement system is made up of a variety of tiny proteins present in the blood that are produced by the liver. They normally circulate as inactive precursors.
The complement system's primary job is to protect the host from infection/inflammation by attracting and increasing phagocytosis by innate immune cells.
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