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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Faulty epigenetic reprogramming in cloned embryo leads to irregularities in gene expression that might result in the abnormal phenotypes in cloning.

异常的表观重编程可以导致异常的基因表达，从而引起克隆动物的诸多异常表型。

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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