| http://www.w3.org/ns/prov#value | - Antigens are often foreign substances such as invading bacteria or viruses. (See also immunogen.) antigen-presenting cell (APC): B cell, macrophage, dendritic cell or other cell that ingests and processes foreign bodies such as viruses and displays the resulting antigen fragments on its surface to attract and activate the CD4+ T cells that respond specifically to that antigen. (See also dendritic
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