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Q. Define opsonin. Name TWO opsonins.

Ans:- Opsonin:- A protein that is bound in recognition & enhances phagocytosis.
Example:- C3b, IgG, IgM,

Antibody-mediated opsonization. FcR on phagocytic cells recognize the Fc region of the antibody.

Opsonization by C3b. CR1 recognizes C3b deposited on antigen

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