In adults, the cells of the immune system originate from:

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The cells of the immune system in adults originate from stem cells in the bone marrow, which differentiate into different types of immune cells such as lymphocytes, monocytes, and granulocytes. Monocytes are a type of white blood cell that differentiate into macrophages and dendritic cells once they migrate to different tissues. Glial cells are cells found in the nervous system and Langerhan's cells are a specialized dendritic cell found in the skin. In adults, cells of the immune system originate from stem cells of the bone marrow. Stem cells differentiate into various types of cells, including white blood cells, which play a critical role in the immune response. Monocytes, Langerhans cells, and glial cells are not involved in the production of immune cells.

In Adults, the Cells of the Immune System Originate From