Final answer:
An epitope is the specific site on an antigen where an antibody can bind and attack. It is a small region within the antigen that binds to a receptor.
Step-by-step explanation:
Definition:
An epitope is the specific site on an antigen where an antibody can bind and attack. It is a small region within the antigen that binds to a receptor.
Example:
For example, a bacterial flagellum can have multiple epitopes with unique three-dimensional structures. Different antibodies can bind to different epitopes on the same antigen.