Well, I think this may not be unrelated to various living cell therapies that are being offered in different forms, possible some of which have been mentioned already on this forum as I recall... One of the features in common to a therapy that has been recommended to me by my doctor in South America is the use of inter-species cells that are injected to stimulate growth of one's own repairing or healthier cells. This from what I understand is really not a new thing, but has not been supported by much U.S. research so far, as far as I can discover. My Colombian doctor wanted to do a procedure where he injected some kind of sheep cell, I think, but not into the brain but into the gluteal region. This did not require immunosuppressive drugs, and he said it would be clear within 30 days whether or not it was going to be a helpful thing for me, based on his before and after body scanning. I shied away from it because although I trust this doctor just about more than anybody, I still wanted to research it a little more vis-a-vis possible risks. He said there was a slight risk of post-procedural infection local to the injection site, and some possible soreness and swelling for a couple of days. But he really did recommend this highly, and enough so that I am considering going back down there to augment what I'm already doing. It was not a terribly expensive procedure (less than $1,000 possibly).

But it looks like some English-language research and propietary interests are possibly starting to catch up in this field. Incidentally this is the kind of thing that I think has been upsetting some North American researchers lately because it is offered directly to consumers through websites, and out of the control of regulatory bodies in the US or UK. I did see some study results by doctors I think in Paraguay or someplace - some consortium of South American doctors - about this kind of living cell transplant study that they did earlier this year in fact, with very promising results for Parkinson's. However, my level of Spanish gets the gist, and not all the nuance, so I was holding off on pursuing it further for the moment.