![]() A hapten is essentially an incomplete antigen. Hapten is a molecule that reacts with specific antibody but is not immunogenic by itself, it can be made immunogenic by conjugation to a suitable carrier. All immunogens are antigens, but all antigens may not be immunogens, some very small molecules called haptens can bind to antibodies or B-cell receptor but they cannot initiate an immune response. Immunogen is a stimulus that produces a humoral or cell-mediated immune response, whereas antigens are any substance that binds specifically to an antibody or a T-cell receptor. ![]() In this blog let us discuss the definition of immunogen, antigen, hapten, epitope, and adjuvant. Majority of antigens are proteins but some are carbohydrates, lipids, and nucleic acids. Whenever we refer a pathogen, we may think the entire microbe is responsible for the disease.But the fact is these organisms possess numerous sites called as epitopes that are recognized by antibodies or receptors on the cells in the immune system.
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