A heterogeneous group of immunocompetent cells that mediate the cellular immune response by processing and presenting antigens to the T-cells. Traditional antigen-presenting cells include MACROPHAGES; DENDRITIC CELLS; LANGERHANS CELLS; and B-LYMPHOCYTES. FOLLICULAR DENDRITIC CELLS are not traditional antigen-presenting cells, but because they hold antigen on their cell surface in the form of IMMUNE COMPLEXES for B-cell recognition they are considered so by some authors.

Synonyms: Cell, Antigen-Presenting, Cells, Immunologic Accessory, Antigen-Presenting Cells, Immunologic Accessory Cell, Cells, Antigen-Presenting, Immunologic Accessory Cells, Antigen-Presenting Cell, Antigen Presenting Cell, Accessory Cells, Immunologic, Antigen Presenting Cells, Cell, Immunologic Accessory, Accessory Cell, Immunologic