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All formed elements arise from stem cells of the red bone marrow. Recall that stem cells undergo mitosis plus cytokinesis (cellular division) to give rise to new daughter cells: One of these remains a stem cell and the other differentiates into one of any number of diverse cell types.
STEM CELL INTRO. Ordinary cells in your body replicate to make new cells of the same type - blood cells make more blood cells, skin cells make more skins cells and so on. However, there is another type of cell, called a stem cell. Stem cells are able to repair or replace damaged tissue. This is why scientists and doctors are so excited about the growing role of stem cells to treat disease, injury, and the deterioration of tissue due to aging.