Donor cell selection is critical for the success of cloning animal, and it is also an important factor affecting the cloning efficiency.

但动物克隆效率仍然很低，供体细胞的选择是动物克隆中的重要步骤。

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The effect of using donor cells of different cell cycle, cell type, chemical activation, as well as refrigeration, on cloning animal has been summarized.

供体细胞的细胞周期、细胞类型、冷冻处理和化学激活等方面都可能影响动物克隆的效率。

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They are experimenting, too, with animal cloning.

他们也在进行动物克隆试验。

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Technology proceeds at such a breakneck pace that sometimes it feels like we're rocketing into science fiction territory: Animal cloning, unmanned aircraft and space tourism are all recent realities.

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In exchange, Brownback backed off amendments that would have banned human cloning and prohibited creating animal-human hybrid embryos.

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Without such safeguards in place, there is no reason to assume that human cloning will not repeat the messy trial and error of current animal research.

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