However, nuclear reprogramming, which stands in the way of reconstructed embryo stem cell research, is still a bottleneck in the procedure of nuclear transfer.

但是核重编程仍是核移植技术的瓶颈，制约了重构胚胎干细胞的研究。

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"It doesn't have to be, you know, embryo stem-cell research or fetal or cloning, " Lott said.

CNN: Lott says he's opposed to federal funding of stem-cell research

On Thursday a team of researchers at Newcastle University in the UK, which hopes to join South Korea in the forefront of stem cell research, also said they had successfully cloned an human embryo.

CNN: Cloning success hailed, feared