Introduction
The complement system is a complex set of proteins that are constantly present in the blood. This cascade system of proteolytic enzymes intended for humoral defense against the action of foreign agents, it participates in the immune response. It is an important component of both the innate and adaptive immune system.
The complement system functions as a cascade of biochemical reactions. Complement is activated by three biochemical pathways: classical, lectin and alternative way. All three ways are produce different versions of activation C3-convertase (a protein that cleaves C3). The classic way (it was opened first, but is a new
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