Creating A Frozen Zoo
Gathering material for a frozen zoo is rendered simple by the abundance of sperm in males. Sperm can be taken from an animal following death. The production of eggs, which in females is usually low, can be increased through hormone treatment to obtain 10-20 oocytes, dependant on species. Some frozen zoos prefer to fertilize eggs and freeze the resulting embryo, as embryos are more resilient under the cryopreservation process. The zoo also collects skin cell samples if such endangered animals and Scripps Research Center has successfully made them in to a cultures of special cells,induced pluripotent stem (IPS) cells. Now, theoretically, they are able to make sperm and egg cells with old skin cells.
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