Hello, Heidi, I wish I had time to read this entire thread now. I'm wondering if your theory fits in with new research regarding LRRK2 mutations:

http://hmg.oxfordjournals.org/cgi/content/full/16/2/223

Parkinson's disease-associated mutations in LRRK2 link enhanced GTP-binding and kinase activities to neuronal toxicity

Human Molecular Genetics Advance Access originally published online on January 2, 2007

Thanks.

By the way, I have bad allergies and have lived on antihistamines since I was a kid. So did my dad, who had PD. I also had some autoimmune problems in the 80's with discoid lupus, confirmed by biopsy.