Goldengirl, does that link has something to do with BBB ?
Turnip, as far as I know there have been many studies about agents that could slow down and even halt PD but they gave no results on people because they couldn't pass the BBB. This method is the most important step for a cure. If you test agents on induced pluripotent stem cells and these agents show to slow down PD or stop it's progression, well then there you have your cure.
For example, curcumin: http://www.ncbi.nlm.nih.gov/pubmed/23325107
But the problem of curcumin is that it doesn't pass the BBB very easily. Also many proteins that could cure PD don't pass the BBB. This method could solve the problem.
So for me, this news is maybe on of the most exciting ones in a long time.