FAQ:The human body contains a trillion cells and 200 cell types. Scientists know that all of the body's different cell types STEM from a master cell. Stem cells are unspecialized cells that have two important characteristics that distinguish them from other cells in the body. First, they are immortal, and in most tissues they are a very rapidly expandable population. Second, they have the remarkable potential to differentiate, or transform into specialized cells with specific functions, such as a heart cell or nerve cell. Stem cells can be classified by the extent to which they can differentiate into different cell types: totipotent, pluripotent, multipotent and progenitor cells.

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