From the article: " ... surgeons removed some of the cells surrounding the nerves that run from Fidyka’s nose into his brain and injected them into t

From the article: " ... surgeons removed some of the cells surrounding the nerves that run from Fidyka’s nose into his brain and injected them into the gap that the knife wound had left in his spine. ... doctors ... believed that if ensheathing cells were injected into his spinal cord they would help injured neurons to cross the wound, healing his spine. The surgeons had to open his skull and take out the ensheathing cells, a five-hour-long operation, and then open up his spine and put them back in—another five hours. "