Submitted by Nimynn t3_y21axx in askscience
cruuzie t1_is27h2q wrote
Reply to comment by Nyrin in Why can we freeze embryos for IVF but not adult humans? What makes it possible for embryos? by Nimynn
So how small is small enough to reliably survive freezing with our current methods? Are we talking a few lumped together cells, ant-sized, mouse-sized?
Nyrin t1_is2a3qt wrote
It's a continuum with bigger, denser, and otherwise harder to consistently rewarm and perfuse ramping the difficulty up, likely on a non-linear scale.
We may well see cryonically frozen lab rats fully resuscitated in the coming years (likely still with lots of complications at first), but we should contain our optimism given there's probably at least at much of a gap between cycling an embryo or tardigrade and cycling a rat as there will be between cycling a rat and cycling a human. We have notoriously hungry brains!
cruuzie t1_is2aiek wrote
Great reply! Thanks!
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