The epitope of antigen determines antibody recognition sites. Each epitope of antigen binds specifically to complementary antibody regions, driving immune specificity. Linear or conformational epitopes are key to vaccine design, diagnostics, and immunotherapy, making them central to understanding immune targeting and molecular recognition mechanisms. https://www.betalifesci.com/blogs/news/antibody-vs-antigen-vs-epitope-vs-hapten-vs-immunogen