Discussion
Antigen binding sites are present in
Answer: A
Correct answer: Fab regions of an antibody
Each Fab fragment carries one antigen-binding site, formed jointly by the variable domains of the heavy and light chains - so neither chain alone constitutes the site. The Fc fragment carries no antigen specificity at all; it is the part that binds Fc receptors and complement and determines what the antibody does once bound.
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