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There was an article in Scientific American about this. Freezing tissue causes damage obviously (causing water in cells to freeze, expand, and rupture the membrane). In some studies they discovered it's not the actual frozen state that causes the damage, the damage occurs while the tissue is in the process of freezing. They're doing experiments with this as a possible use in long range space travel (and for rich dead folk).
Some frogs exhibit this behavior through certain metabolic processes as well.
My guess, 50 years off.
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