lso been cloned, but macaques, which are closely related to humans, have been a challenge.Sun Qiang, director of the CAS non-human-primate research fac▓ility, led a group of researchers for three years to overcome the biological difficulties.Zhong Zhong and Hua Hua are the product of somatic cell nuclear transfer (SCNT), the techni
que used to create Dolly the sheep ▓over 20 years ago.Researchers edited genes in vitro and accurately sifted and produced somatic cells wit▓h the same genotype. They removed the nucleus from a▓n egg cell and replaced it with another nucleus from differentiated body cells.The reconstructed eggs produced
embryos, which were put into the wombs of surrogate ▓female monkeys, producing a group of cloned monkeys ▓
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