Bone grown from human embryonic stem cells: The study, published in the early online edition of Proceedings of the National Academy of Sciences during the week of May 14th, is the first example of using bone cell progenitors derived from human embryonic stem cells to grow compact bone tissue in quantities large enough to repair centimeter-sized defects. When implanted in mice and studied over time, the implanted bone tissue supported blood vessel ingrowth, and continued development of normal bone structure, without demonstrating any incidence of tumor growth.
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