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Japanese researchers report that mice with spinal cord injuries were able to regain some movement after the transplantation of dental pulp stem cells. see
http://www3.nhk.or.jp/daily/english/20111202_04.html
. A company called Geron has recently discontinued work doing something similar with stem cells. It had been conducting safety trials on 4 patients. see
http://www.guardian.co.uk/science/2011/nov/15/geron-abandons-stem-cell-therapy
.
Note I own stock in Geron.