Healthcare systems depend on blood donations, which are harmless for the donors because humans usually just reproduce blood and can repeat the process over and over. What about blood is so special that we can’t manufacture it in a lab or replace is with artificial blood?
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Well it seems to be something we are working on developing. But my guess would be it’s just not so easy retro-engineering (?) something that was a billion years in development and putting it in bodies that look to destroy anything that doesn’t belong.
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