Generally, the older the donor organism, the more difficult it is to get the DNA from the harvested nucleus to reactivate the genes that allow the clone organism to grow. Previous efforts to clone (Macaca mulatta) using have been successful, but the project that produced Zhong Zhong and Hua Hua used significantly older donors: fetal , which are key cells in connective tissue, and adult monkey .
Generally, the older the donor organism, the more difficult it is to get the DNA from the harvested nucleus to reactivate the genes that allow the clone organism to grow. Previous efforts to clone (Macaca mulatta) using have been successful, but the current attempt used significantly older donors: fetal , which are key cells in connective tissue, and adult monkey .
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project that produced Zhong Zhong and Hua Hua
current attempt