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Their amino acids will make an excellent source material for the 3D food printers.

Nah, I'm pretty it will be more efficient to just grow meat in a lab.

Out of what?

Try googling "in vitro meat" and you may find some answers, but I don't know if this problem is solved yet. This article mentions algae as a possibility:

https://blogs.discovermagazine.com/crux/2012/04/24/steak-of-...

I don't look forward to my future as soylent green

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