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My take is our brains produce an overabundance of dopamine. So when the levels drop to around 70-80% of normal is when we become symptomatic. -Terry > If I heard M. Fox right by the time one is diagnosed with PD 80% of the > Domamine Producing Cells have been destroyed? > > Larry ---------------------------------------------------------------------- To sign-off Parkinsn send a message to: mailto:[log in to unmask] In the body of the message put: signoff parkinsn