In fact, the scientists had mapped only a certain portion of the epigenomes of two cell types (an embryonic stem cell and another basic cell called a fibroblast).

事实上，科学家仅仅绘制了两种细胞外基因的某一部分而已。

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Those taken from days-old embryos, called embryonic stem cells, are the most malleable and can produce all of the cell types.

从几天大的胚胎中获取的这些细胞叫作胚胎干细胞，是最有分化性的，能分化成各种细胞类型。

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According to the different donor types, mammalian nuclear transfer can be divided into two kinds: embryonic nuclear transfer and somatic nuclear transfer.

按照供体细胞的不同，哺乳动物核移植研究可分为两种：胚胎细胞核移植和体细胞核移植。

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The adult cells are thought to revert to a state similar to that of embryonic stem cells, which are even less specialised, before becoming the new cell types.

BBC: Stem cell research doubts

Embryonic stem cells have great potential for treating human disease because of their ability to generate almost all the cell types found in the adult body.

BBC: NEWS | Health | 'This is a very exciting advance'