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> Greg wrote: It is important to remember how long it appears to take to become symptomatic with Parkinson's. Not until 80% of the neural cells are dead or dormant do the first symptoms of PD appear. ------------------------ My question is......how do scientist know this?? This is one of those suppositions that I am not sure is backed up by fact. Since PET scans are seldom done in PD and we have already been made aware on this list of the supreme difficulty in obtaining PWP's brains for autopsy, where did this 80% fact come from? I'm wondering if this fact is like the 'estrogen prevents heart disease and dementia' proclamation. ------------ God bless Mary Ann (CG Jamie 65/25 with PD) ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn