When a human responds to a bacterial antigen,the bacterial antigen is classified as a(an):

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Heteroantigens are antigens that come from foreign sources, such as bacteria or viruses. Autoantigens are self-antigens, meaning they come from the body's own cells. Alloantigens are antigens that come from other members of the same species, such as blood group antigens. Holoantigens are not a recognized classification of antigens.

When a Human Responds to a Bacterial Antigen,the Bacterial Antigen