In an E-mail, the journal cited the highly publicized 2004 fraud that came out of South Korea, where researchers led by Hwang woo-Suk claimed to have produced stem cells from a cloned human embryo.

在一封e - mail中，自然杂志特别引用了2004年广为传播的韩国Hwang woo - Suk小组得到人类克隆胚胎的丑闻。

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Epigenetic modifications plays an important role in gene expression and the early development of cloned embryo.

表观遗传修饰在基因表达和克隆胚的早期发育方面有重要作用。

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So the current research was designed to study main items of pig somatic nuclear transfer systematically such as somatic donors, recipient oocyte, culture of cloned embryos and embryo transfer.

体细胞核移植为人们生产不引起免疫排斥以及无内源性病毒的猪提供了可能。

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But creating a cloned embryo requires human egg cells, and egg cells aren't cheap.

FORBES: Cloning's High Cost

Cells would be removed from someone with, say Parkinson's, and injected into a donated egg to create a cloned embryo.

FORBES: Cell News Opens Door To Drug Discovery

Arlen Specter of Pennsylvania, told his colleagues that calls for quick legislative action were unwarranted because there wasn't a clear enough understanding of the process that led to the reported creation of the cloned embryo.

CNN: Democrat blocks Senate debate of cloning ban