Researchers at Stanford University have used human stem cells to repair the stroke damaged brains of laboratory rats. The study marks the first time human embryonic stem cells improved the health of rats, without forming tumors after being transplanted- a common problem in stem cell research.
Researchers transplanted neural stem cells into the brains of 10 rats induced with a stroke that left one limb weak. When tested after four weeks and again at eight weeks, the rats were able to use their limbs better than rats not given the transplant. Researchers say more studies need to be done on other animals before human testing can take place.