South Korean scientists use cloning to bring dead animals “back to life”
Jurassic park, a classic Hollywood science fiction film, depicts how humans used genetic technology to bring extinct dinosaurs back to life. With the development of genetic technology, the scenes in the movie may become a reality in the near future. South Korean researchers have cloned a dead cow using a technique that involves freezing and thawing eggs at break-speed, Australian media reported on June 15.
The jeju national university research team that carried out the cloning experiment announced that it had developed a new cloning technique that could be used to clone large Numbers of animals that have been dead for a long time. Using this technique, the team managed to bring a dead cow back to life.
In 2007, the team implanted the nucleus of a recently deceased cow into some eggs, then used in vitro fertilization to create a cow embryo and freeze it at minus 196 degrees Celsius. Last January, they thawed out the embryos and implanted them into the womb of another cow, which was born naturally in October. Tests showed that its genetic structure was identical to that of the dead cow. The process of creating cloned embryos is very difficult. "Before that, our biggest obstacle was freezing and thawing, but this time we succeeded.
In fact, prior to this, there has been the use of cloning technology to bring dead animals "back to life" precedent. In September 2003, Brazilian researchers cloned a Dutch cow that had died in an accident. In November 2008, Japanese scientists announced the successful cloning of a mouse that had been frozen for 16 years.
Scientists in the United States have also studied techniques for cloning animals from frozen cells. The researchers believe this has important implications for the protection of endangered species.
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