Where Are We in Understanding Parkinson's Disease?

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Well we understand where the brain pathology is and what the neurotransmitter is that's missing, then there are drugs that allow us to replenish that transmission, but over a period of time the receptor cells start not being as receptive as it was before, and people's Parkinson's progresses, and the amount of medication we can provide is insufficient to prevent the progressive nature of the symptomatology.

The question is how do we prevent that evolution as a disease itself and we have no medication for that?.