Antigen
Introduction
Molecules that can be recognized by the immunoglobulin receptor of
B cells or by the T-cell receptor when complexed with major histocompatibility
complex (MHC) are called antigens. The word antigen is a
shortened form of the words“antibody generator.” Antigens are substances that
react with antibodies, while immunogens are molecules that induce
an immune response. In most cases, antigens are immunogens, and the terms are
used interchangeably. The antigens that are not immunogenic but can take part
in immune reactions are termed as haptens. The term immunogenicity
means the ability of an antigen to elicit an immune reaction in the form of a
B-cell or T-cell response, whereas the term antigenicity means just
the ability to combine specifically with the prod-ucts of the above responses.
All molecules that are immuno-genic are antigenic too, but all antigenic
molecules cannot be considered immunogenic. Thus, haptens can be said to lack
immunogenicity.
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