As I read the study it said that "10%" of PD was genetic---so those of us who have family members with PD and have been puzzled about the findings must be in the 10%, right ? The rest of us haven't much of a clue why we got it----pesticides on the lawn, well water, termite control, carbon monoxide, whatever---is it better to know or not to know ? Camilla Flintermann, CG for Peter 80/70/55 Oxford, Ohio http://www.newcountry.nu/pd/members/camilla/one.htm <[log in to unmask]> "Ask me about the CARE list for Caregivers of Parkinsonians ! "