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From: Ron Reiner Subject: Re: Multiple Autoimmune Disorders and PD >I cannot believe that PD is caused directly by an auto-immune disorder since >the immune system does not operate in the brain. Perhaps these disorders >and PD have a common root cause. However, it *is* possible that an auto-immune disorder caused the progressive death of cells in the substantia nigra. It is my own hypothesis that there may be a common causative factor for several neuro-degenerative disorders, especially those that affect the brain. Whether or not one gets one particular disorder or another depends on which *part* of the brain is attacked. This would help explain the similarity of symptoms between Alzheimer's, PD, etc. Jim