There are many issues in human stem cell research and use, most of the issues have received extensive discussion over the past few years.

人类胚胎干细胞研究和使用面临很多问题，并且大部分已经进行了广泛的讨论，但目前仍有一些问题很少进行讨论。

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It would be better to derive human stem cell lines from the body's mature cells, he said, a method that researchers are still working on.

由身体成熟细胞培养为人类胚胎干细胞会是一个更好的办法，不过研究人员还在努力研究这项技术。

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They varied experimental conditions to see if the presence or absence of spinal cord lesions had an effect on the survival and maturation of human stem cell grafts.

他们摸索了各种实验条件以观察脊髓损伤或者不损伤的的条件下是否对移植的人类干细胞的生存或者成熟有影响。

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But opponents say stem cell experiments are wrong because human embryos are destroyed.

VOA: special.2009.04.07

stem cell researchers have found a way to get perfectly usable stem cells from fully grown human beings.

干细胞研究者已经找到了一种方法，
可以从成年人身上获取可用的干细胞。

干细胞和伦理 - SpeakingMax英语口语达人

Finally, we assemble all the chunks in a human stem cell, which would enable you to finally create a Neanderthal clone.

FORBES: Is It Possible To Clone A Neanderthal?

Professor Azim Surani, of the University of Cambridge, said the research should allow scientists to create a large range of human stem cell types, which could prove invaluable in studying disease.

BBC: RELATED BBC SITES

The Secretary of Health and Human Services (Secretary), through the Director of NIH, may support and conduct responsible, scientifically worthy human stem cell research, including human embryonic stem cell research, to the extent permitted by law.

WHITEHOUSE: THE WHITE HOUSE