we don't understand enough about the connections between the brain and the rest of the body to be able to transplant it. the biggest challenge is reconnecting the brain stem with the spinal column...can't happen with our current lack of understanding. here's a good overview of the brain: <a href="http://www.encephalitis.info/the_illness/Types%20of%20Encephalitis/Brainstem.htm">http://www.encephalitis.info/the_illness/Types%20of%20Encephalitis/Brainstem.htm</a>
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