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Stem cell #
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http://en.wikipedia.org/wiki/Stem_cell

Stem cells are undifferentiated biological cells that can differentiate into specialized cells and can divide (through mitosis) to produce more stem cells.

There is a homeostatic equilibrium between the replication, self-renewal, and differentiation of stem cells and the death of the mature, fully differentiated cells.

Stem cell are characterized by two important properties

  1. Self-renewal, which permits stem cells to maintain their numbers.
  2. Asymmetric division, in which one daughter cell enters a differentiation pathway and gives and rise to mature cells, while the other remains undifferentiated and retains its self-renewal capacity.

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