Researchers in Japan have developed a way to freeze dry rodent ejaculate between thin plastic sheets and sticky tape it to postcards, with the samples surviving long journeys to produce healthy pups.
Ito is a PhD student at Professor Teruhiko Wakayama's lab, which had previously been the first team to succeed in freeze-drying mammal sperm, and send it to the International Space Station to study the effects of cosmic radiation. Using this technique, they were able to produce a "sperm book" made of postcards with different samples, "a completely new concept that no one has ever thought of before," said Ito.
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