The theory is that because these stem cells are fetal cells, they are designed to proliferate and give rise to new tissue, which means they have the potential to produce tumors.

由于那些干细胞来自胎儿，它们本来就是要通过自身繁殖来形成新的人体组织，因此理论上它们具有产生肿瘤的潜在可能。

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She describes underground stem-cell clinics in China and a Japanese doctor using the cells to give skinny women bigger bosoms.

她描述了中国秘密的干细胞研究中心以及日本医生使用干细胞给瘦小的女人隆胸。

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Embryonic stem cells are considered the most powerful kind of stem cells as they have the potential to give rise to any type of tissue.

胚胎干细胞被认为是作用最大的干细胞，因为它们有潜力来引导所有种类的组织。

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Embryonic stem cells can give rise to every cell type in the body.

能分化出人体中,各种类型的细胞。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

When it comes to people, said Dr. Hsieh, it might be similarly effective to give the therapy in the first week after a heart attack, when stem-cell activity is highest.

WSJ: Nanotechnology Holds Promise for Heart Patients

And they would like to come up with a way of finding an ethical way out, essentially, that would give the scientists what they need to develop the kinds of therapies that might come from embryonic stem cells or their equivalent without the moral baggage.

NPR: Ethical Guidelines for Stem Cell Research Proposed

Then there's a completely new idea, which is to generate a kind of a cell that you would merge with a kind of an egg, and you'd get something that was kind of an embryo but it wasn't really an embryo, and it wouldn't have the potential to grow into anything, and maybe those would give rise to stem cells.

NPR: Ethical Guidelines for Stem Cell Research Proposed