الفهرس 
stem cells
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Abstract
Stem cells have the remarkable potential to develop into many
different cell types in the body during early life and growth. In
addition, in many tissues they serve as a sort of internal repair system,
dividing essentially without limit to replenish other cells as long as the
person or animal is still alive. When a stem cell divides, each new cell
has the potential either to remain a stem cell or become another type of
cell with a more specialized function, such as a muscle cell, a red blood
cell, or a brain cell.