According to the BBC website:
Scientists have identified a way of prompting nerve system repair in multiple sclerosis (MS).One reason my ears pricked up when I heard of it was that neurogenisis was mentioned and I had read the chapter on it (3. New Neurons for Old Brains) in the book "The Plastic Mind" this weekend.
Studies on rats by Cambridge and Edinburgh University researchers identified how to help stem cells in the brain regenerate myelin sheath, needed to protect nerve fibres.
The stem cells referred to in the study are neural stem cells, not embryonic stem cells, and they are producing new neurons in your brain all the time.
I had no idea.
All hail Professor Charles ffrench-Constant, for his fascinating research and wonderful name.