AFAIK it all boils down to the fact that during embryonal development our cells, which at that point were just a blob of undifferentiated autonomous chemical machines, somehow managed to unanimously agree upon the cardinal directions (up-down, left-right, front-back) for future development - and thanks to this, we don’t have toes growing out of our ears.
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It’s not that incredible, considering we can get cysts full of teeth and hair inside the body
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Imagine if you suddenly sprouted a tumor with functional tastebuds in your colon
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Wonder if we could use that phenomena to regenerate teeth in a lab for replacements and dentures.
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