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"We can cryopreserve worms, and then thaw them for study later. That means that we can stop evolution from happening in the lab, something impossible with most other animal models, and very valuable when we want to compare animals that have experienced different evolutionary histories," said Rockman.

It is possible that clones could be produced from cryopatients at some point, though to do so, it would be enough to cryopreserve live body cells, not the brain or the whole body.

There were nine embryos left over from the three cycles, and they signed agreements with the hospital to “cryopreserve” them for transfer in the future.

Generally, researchers cryopreserve mouse embryos to maintain mutant mouse lines in central repositories, but Niswander’s team hadn’t yet completed the necessary experiments.

But it is getting more requests from labs to help them cryopreserve valuable strains—freezing down sperm or embryos that can later be thawed.