For those not put off already by the title, Simon does a great job of explaining another piece of the PD puzzle, via the following SoPD blog post:
We’re re-branding: It’s now called PARPinson’s | The Science of Parkinson's
The comment section of this SoPD blog post is also well worth a read. The following link is to an article referred to by Patrik Brundin in one of those comments:
Science Magazine - November 2, 2 18