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The role of complement proteins: 

(A) Defense 

(B) Helps immunity of the body 

(C) Not predicatable 

(D) None of these

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Correct option: (D) None of these


Complement system is composed of about 20 plasma proteins that complement the functions of antibodies in defending the body from invading antigens. The complement system helps the body immunity by promoting phagocytosis, formation of antigen-antibody complexes and inflammatory reaction.

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