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Antigen Presenting Cell
Definition 1
A cell that enables a T-lymphocyte to recognize an antigen by engulfing the antigen, breaking down the antigen into smaller fragments which bind to MHC molecules on the surface of the antigen presenting cell. The T-lymphocyte can now recognize and bind with the MHC-linked antigen. (NCI Thesaurus)
Definition 2
A type of immune cell that boosts immune responses by showing antigens on its surface to other cells of the immune system. An antigen-presenting cell is a type of phagocyte. (NCI Dictionary)
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