accessory cells
Cells that interact, usually by physical contact, with T-lymphocytes and that are necessary for induction of an immune response. Include antigen presenting cells, antigen processing cells, etc. They are usually MHC Class II positive (see histocompatibility antigens). Monocytes, macrophages, dendritic cells, Langerhans cells, B-lymphocytes may all act as accessory cells.

Dictionary of molecular biology. 2004.

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