Thanks GG & Sugarplum,
I think you are right that this particular piece of research will take a long time to directly benefit people with parkinson's. It is really important that we continue with it as work like this leads to understanding the underlying processes of the condition. Without that it will be hard to find better treatments.
There are other research projects which are much closer to possibly offering benefits to PWP including the Transeuro study which has just started transplanting replacement cells into human brains. Later this year we are expecting the results from a 3 year study of growth factor infusions into brains.