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> prion diseases existed more among cannibal groups

Presumably one would exclude protein classes prone to prionic misfolding from the synthetic meat. Personally, I have no moral qualms with someone sampling lab-grown human flesh, though I’d probably pass.

Aren't prions nerve cells + something something? Muscle cells are not that different from muscle cells of animals we eat regularly.

Prions are misfolded proteins that act as enzymes to turn healthy proteins into more of themselves. The scary ones destroy the nervous system, but that's not an inherent part of being a prion.

Large-scale meat synthesis is a bacteriological outbreak nightmare even falling far short of that, but yeah.