Researchers have developed a new technique to improve the efficiency of rat sperm cryopreservation, a process that is usually extremely difficult. Their technique makes it possible to produce more than 300 offspring from one male rat through in vitro fertilization using frozen sperm. It can be used to maintain specific strains of genetically modified rats that are in high demand for medical research.
from Health & Medicine News -- ScienceDaily https://www.sciencedaily.com/releases/2020/01/200131114743.htm
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