Now from my understanding. parkinsons is when a part of your brain dies and another close by part gets overclocked and starts malfunctoning and causing the tremors. The fix for this being a pacemaker to regulate the impulses. But wouldnt the best cure be simply clone the part of the brain and replace it? As it is dead anyhow. and yes i know. the crazy people dont like the cloning issues. But maybe the same can be used to find a compatible donor, but usually donors donate after death, and usually the brain dies.