A bit of history about stem cells
http://www.stemcellsarthritistreatment.com Early work by Friedenstein and associates provided intriguing information on the potential for bone marrow to differentiate into stem cells. They cultured bone marrow cells and removed cells that didn #39;t appear to adhere to each other. After further culture, they found that the most adherent cells were spindle shaped and resembled deposits of cartilage and bone. Other groups confirmed the findings and they found that these cells were multipotent and could differentiate into bone cells, cartilage cells, fat cells, and muscle cells. The name they gave to these multipotent cells was "mesenchymal stem cells." http
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A bit of history about stem cells - Video