Let's talk neural tissue transplantation. Some papers just describe injecting cells into a brain region, while others talk about grafts. What's the procedure for a neural graft? ...
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The procedure described here, http://www.jneurosci.org/content/37/7/1820 … says lesioning followed by deposition of tissue. "Care was taken to maintain the original dorsoventral and anteroposterior orientations of the cortical fragments during the transplantation procedure." So fairly large pieces.
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Putting aside the engineering difficulty of ensuring the long-term survival and incorporation of the graft, let's think about tissue engineering for implantation (without lesioning).
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The sexy key-terms here are "corticopoiesis" and "cerebral organoid".
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For some reason, "recently deceased identical twin" does not seem to be a key term.
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I don't really have a point except that I don't see any huge reason why you can't stick immuno-compatible brain fragments into a person and give them an upgrade. And that's earth-shakingly huge, if actually doable.
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If a little surgery is most all of what it takes to get an anthropomorphic singleton, that'll be a little funny, but it'll mostly be tragic that we didn't figure it out sooner.
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