RT Journal Article SR Electronic T1 Translating Stem and Progenitor Cell Biology to the Clinic: Barriers and Opportunities JF Science JO Science FD American Association for the Advancement of Science SP 1442 OP 1446 DO 10.1126/science.287.5457.1442 VO 287 IS 5457 A1 Weissman, Irving L. YR 2000 UL http://science.sciencemag.org/content/287/5457/1442.abstract AB Stem cells are the natural units of embryonic generation, and also adult regeneration, of a variety of tissues. Recently, the list of tissues that use the model of differentiation from stem to progenitor to mature cell has increased from blood to include a variety of tissues, including both central and peripheral nervous systems and skeletal muscle; it is also possible that all organs and tissues are derived from, and still contain, stem cells. Because the number and activities of stem cells and their progeny are homeostatically regulated, clinical stem cell transplantation could greatly add to the physician's armamentarium against degenerative diseases.