an essay on stem cells
Asked by | 5th May, 2008, 03:09: PM
Stem cells are found in most multi-cellular organisms. They are capable of retaining the ability to reinvigorate themselves through mitotic cell division and can differentiate into a diverse range of specialized cell types.
Stem cells differ from other kinds of cells in the body. All stem cells—regardless of their source—have three general properties:
they are capable of dividing and renewing themselves for long periods;
they are unspecialized; and
they can give rise to specialized cell types.
The two broad types of mammalian stem cells are: embryonic stem cells that are found in blastocysts, and adult stem cells that are found in adult tissues.
In a developing embryo, stem cells can differentiate into all of the specialized embryonic tissues.
In adults, stem cells act as a repair system for the body, replenishing specialized cells, and also maintain the normal turnover of regenerative organs.
The use of stem cells in medical therapies has been proposed.
Answered by | 12th May, 2008, 10:33: AM
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