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What are antigens?

Answer:

An antigen (from antibody-generating) or immunogen is a molecule that sometimes stimulates an immune response. The word originated from the notion that they can stimulate antibody generation. We now know that the immune system does not consist of only antibodies. The modern definition encompasses all substances that can be recognized by the adaptive immune system.
Antigens are usually proteins or polysaccharides.
any material usually a protein that is recognized as foreign and elicits an immune response.

First answer by Timi1982pr. Last edit by Timi1982pr. Contributor trust: 9 [recommend contributor ]. Question popularity: 13 [recommend question].

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