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4:58
YouTube
Hussain 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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Sep 2, 2020
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