Every human being is created from stem cells. A stem cell is a cell that has the ability to divide for indefinate periods—often throughout the life of the organism. Stem cells can be used strictly for repairing other damaged cells, such as blood, skin, and other organs. However, when stem cells mature, they become specialized stem cells or organs. Stem cells at there mature state form heart, muscle, or even brain cells. The National Institute of Health defines the embryonic stem cells have special properties:

· Capable of undergoing an unlimited number of symmetrical divisions without differentiating

· Exhibit and maintain a stable, normal complement of chromosomes

· Pluripotent ES cells can give rise to diff

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