Antigen presenting cells

These are cells, such as monocytes, macrophages, dendritic cells of lymphoid organs, renal mesangial cells, Kupffer's cells, and alveolar type 2 lining cells, and certain other cells of the immune system such as lymphocytes and thymic epithelial cells, that perform the function of expressing foreign antigens on their surface, bound to the cells own MHC molecules. The self antigens that are involved belong to class 2 of the major histocompatibility complex.