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Gene therapy

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Welwordion:
A problem with interspecies transfer is, that ribosomal Dna is independent from nucleus Dna such the nucleues might not find the right "tools", the organells might not be compatible with the nucleus commands.
As for a method, I read an article about cell fusing, which allows two foreign cells to form any hybrid and seems  sometimes naturally occur when foreign cells are introduced, such if the old nucleus would be somehow destroyed by the new one this would solve the problem.
A further problem is biochemical compatibility certain enzymes, hormones might not work with existing receptors as well as certain stuff like insulin might not be produced correctly.
Also as the metabolism is optimized to certain temperatures, energy consumption rates and type of foods there might be a large drop in effectivity of the whole system.

Numsgil:
Note that the problems of not finding the right tools are greatly reduced the closer the animals are related.  Between vertebrates there probably isn't too much issue.  Between animals and plants there are some serious issues.  Between bacteria and eukaryotes, there's some serious serious issues.

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