At its simplest, it is a progressive neurological disorder, which so
far cannot be cured. It is variable in its progression, i.e. some people
progress more slowly than others, and the symptoms can be effectively
controlled with medication for many years. Parkinson's results from a
shortage of dopamine, a chemical that helps instructions from the brain
to cross from one nerve cell to the next, in a part of the brain called
the substantia nigra, which has to do with controlling movement.
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