Stem Cells and Progenitor Cells
Stem cells differentiate into progenitor cells, which are more developmentally committed to a cell line than are stems, but which are nevertheless undifferentiated or immature in comparison to those cells that have differentiated and matured into specialized tissue cells. Progenitor cells are multipotent or unipotent.
Tissue damage or immune stimuli can activate progenitor cells through growth factors or cytokines, leading to increased cell division important for the repair process.
[] labeled photomicrograph of bone marrow, diagram of adult stem cell plasticity, diagram of stem cell versus progenitor cell []
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