1. Every antibody is designed to target a specific antigen.
2. Interaction occurs between antigenic determinants (epitopes), situated on the combining sites of antigens, and the corresponding paratopes on antibodies.
3. The variable regions of antibodies house the antigen-binding sites (paratopes).
4. Minute differences in the variable regions contribute to the high specificity of each antibody for a particular antigen.
5. The unique variable region allows the antibody to identify a specific antigen, fostering a lock-and-key interaction that results in the formation of an antigen-antibody complex.
Creation of the antigen-antibody complex
