I heard this story on TV news-- few days After my neuro discussed Regeneration.... fact that cells , nerves , etc CAN regenerate... vs old belief that it can't happen.

He believes stem cell (not embryonic but "donor" ) research, development--and application will bring new realm of treatmt potential , and the cure of many diseases.
He blames political - esp. current administration -for this not advancing more but does feel very hopeful will soon be changing.