Word: meiotic
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Dates: during 2000-2009
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...human egg is a single, liquid-filled cell that is extremely sensitive to temperature changes; ice crystals can easily rupture cell walls, and the solutions used to preserve the egg sometimes wind up destroying it instead. Also, the egg's chromosomes are in a particularly exposed state. If the meiotic spindle--which holds the chromosomes together and pulls them apart as the egg develops--breaks down, as it tends to do when the egg is frozen and later defrosted, then nothing can be done to save...
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