Complement component 3
Complement component 3, often simply called C3, is a protein of the immune system that is found primarily in the blood. It plays a central role in the complement system of vertebrate animals and contributes to innate immunity. In humans it is encoded on chromosome 19 by a gene called C3.
Deficiencies and defects of C3 result in the affected person being immunocompromised and particularly vulnerable to bacterial infections.
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