Previously, researchers using somatic nuclear cell transfer would get fewer and fewer animals every time they tried to make a clone from a clone. Eventually, they wouldn't get any new clones at all. Cloned mammals also often died sooner than their non-cloned counterparts.
在此之前,运用体细胞克隆技术反复克隆动物时,被克隆的动物数量会越来越少,直到最终无法克隆出新动物为止。被克隆出的哺乳动物也会比非克隆的同类动物死得更早。
The cloning team protected the mice's DNA from the genetic abnormalities they (the humans) think reduced the efficiency of previous cloning efforts. The researchers didn't lose any cloning efficiency over their 25 generations, they reported, and their cloned mice lived normal lifespans of about two years.
这支研究团队保护了小鼠的基因,使其不发生基因异常。他们认为,基因异常正式降低克隆形成率的罪魁祸首。研究者称,这25代小鼠的克隆过程中克隆形成率并没有降低,小鼠的寿命也很正常,约能生存两年时间。
Cloning could help reproduce animals for farming or conservation, Sayaka Wakayama, a biologist at the RIKEN Center for Developmental Biology who led the cloning study, said in a statement.
日本理化研究所的生物学家若山清香是这次研究的负责人,他在一个声明中提到,克隆技术可以繁殖动物,为农业和动物保护服务。
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