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The epitope, also known as antigenic determinant, is the part of an antigen that is recognized by the immune system, specifically by antibodies, B cells, or T cells. The part of an antibody that binds to the epitope is called a paratope. Although epitopes are usually non-self proteins, sequences derived from the host that can be recognized (as in the case of autoimmune diseases) are also epitopes. The epitopes of protein antigens are divided into two categories, conformational epitopes and linear epitopes, based on their structure and interaction with the paratope.
To find epitopes to use for the vaccine, in silico mapping is often used.Once candidate epitopes are found, the constructs are engineered and tested for vaccine efficiency. While epitope-based vaccines are generally safe, one possible side effect is cytokine storms.