antigen-presenting cell

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A cell, such as a dendritic cell or macrophage, that ‘presents’ foreign antigens to T cells as part of the immune response. A direct reaction between these lymphocytes and foreign antigens is not common. The antigen-presenting cell takes in the foreign protein, processes it, and then displays peptide fragments on its surface as a complex with MHC class II proteins.

Subjects: Chemistry — Medicine and Health.

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