The portion of an antigen that distinguishes it from other antigens is known as its:

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The most antigenic component of an antigen-the part of it to which antibodies bind-is its epitope. A cluster of differentiation is a set of cell surface markers that cells of specific types or specific levels of maturation display on their cell surfaces. An immune complex is the term used to describe an antigen bound to an antibody. Immunocompetence is the opposite of immunodeficiency. It is the ability to mount an effective immune response to a foreign antigen.

The Portion of an Antigen That Distinguishes It from Other