Fig. 9: Opsonization (Enhanced
The Fab portion of the antibody IgG binds to epitopes of an antigen such as this bacterium. The Fc portion of IgG then binds to Fc receptors on phagocytes for opsonization or enhanced attachment. Once attached to the phagocyte the microbe can be engulfed more efficiently and placed
in a phagosome. Complement pathway proteins such as C3b and C4b can also function as opsonins.
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