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They are derived from hematopoietic bone marrow progenitor cells and can be found throughout the body poised as sentinels in locations such as the skin, lungs, or liver, as well as immune organs such as the thymus, lymph nodes, or spleen. They can also be found in an immature state in the blood. Dendritic cells serve as antigen-presenting cells, with a primary function of processing and presenting antigens to T-cells to facilitate an immune response.\nUpon encountering an antigen, dendritic cells engulf the pathogen via phagocytosis and subsequently process the pathogen into antigens. These antigens are then presented on the surface of the dendritic cell in the context of major histocompatibility complex (MHC) molecules. The dendritic cell migrates to the lymph nodes, containing naive T-cells, and presents the antigens to them. This process triggers the activation of cognate T-cells into effector T-cells, which can then recognize and eradicate cells bearing the same antigen.\nAdditionally, the dendritic cells can influence the type of immune response the body will mount. They communicate with T-cells through the use of co-stimulatory molecules and cytokines. Depending on the type of co-stimulatory molecules used and the set of cytokines released, dendritic cells can promote the development of a cellular immune response, dominated by cytotoxic T cells effective against intracellular pathogens such as viruses, a humoral response, mediated by B cells and effective against extracellular bacteria and toxins, or a tolerogenic response. 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