Cryopreservation of sperm, eggs and embryos refers to the application of low-temperature biological technology to store them in a low-temperature or ultra-low temperature environment, so that the metabolism and division of cells are slowed down or stopped, even if their development is basically paused. When normal temperature is restored by thawing technology, it can continue to develop or rejuvenate. At present, the common application is to place sperm, eggs and embryos in an environment of -196 ℃ liquid nitrogen, which can be stored and transported for a long time.
