What is a stem cell?

A stem cell is a cell that has the ability to duplicate itself endlessly and to become cells of virtually any organ and tissue of the body.

Embryonic stem cells are cells extracted from the blastula, the very early embryo, that have an exceptional ability to duplicate in vitro, that is in a test tube, and to become cells of almost any tissue.

Adult stem cells are cells found in an organism after birth. Until very recently, it was believed that adult stem cells could only become blood cells, bone and connective tissue. But recent development over the past 5 years have revealed that adult stem cells have capabilities similar to embryonic stem cells.

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