"The stem cells have a certain positive effect following injury, but not enough for spinal cord functionality to be restored," says Jonas frisen.

“干细胞在损伤后有某种正面效果，但是对脊髓功能的恢复是不够的，”Jonas frisen说。

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In 2005, a Swedish stem cell biologist at the Karolinska Institute in Stockholm, Jonas Frisen, decided to see if he could date people using the same technique.

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