Antigen
4:58
YouTubeHussain Biology
Antigen
An antigen (Ag) is a molecule or molecular structure, such as may be present at the outside of a pathogen, that can be bound to by an antigen-specific antibody (Ab) or B cell antigen receptor (BCR). The presence of antigens in the body normally triggers an immune response. The term "antigen" originally described a structural molecule that binds ...
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