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When looking for causes of PD, we have to consider the fact that apd has been known and discribes for at least 100 years, and, some researchers believe, has been around for more than 2,000 years. So we have to look for a cause that existed then, brfore the development of modern chemicals. If we consider the generally accepted proposition that PD combines a genetic pre-disposition with an external toxic event, then we might say that ANY external event, including exposure to toxic chemicals, might trigger an underlying genetic predisposition. Dr J. F. Slattery PhD Soc Sc ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn