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ensure accuracy. Stem Cells and the Future of Regenerative
Medicine the results of experiments with stem cells in rodents
are not useful. Those results have prompted new theories about
the source and significance of regenerative capabilities in all
cells, about the process of cellular differentiation, and about
the role of the physiological environment in inducing cells of
all kinds to express their different characteristics (Blau et
al., 2001). All somatic cells in an organism contain the same
genetic information, but it is not yet known what causes parts
of the genetic code to be expressed in some cells and different
parts to be expressed in others. This raises important and
interesting questions about the ability of a cell of one type to
become another type. Emphasizing how little is understood about
the process that controls