Methods Serum free cells suspension culture and single cell cloning technique were used to isolate neuroepithelial stem cells.

方法利用无血清悬浮培养、单细胞克隆技术分离神经上皮干细胞；

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The Roslin Institute's Dr. Ian Wilmut, who pioneered the technique that cloned Dolly from a single mammary cell from an adult sheep, said that while human cloning is theoretically possible, he saw no reason to do so.

CNN: Oppose experiments on humans