Which is incorrect about the Fc region of an immunoglobulin?
A. It determines the antibody's distribution in the body.
B. It forms the antigen binding sites.
C. It contains an effector molecule that can fix complement.
D. It contains an effector molecule that can bind to cells such as macrophages and mast cells.
E. It determines the class to which the immunoglobulin belongs.
Answer: B
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