The scientists claim the rat stem cells grew in the niche left by the absent mouse pancreas and so almost any organ could be produced in this way.

科学家们声称大鼠干细胞刚好在小白鼠缺失的胰腺所在位置生长，所以几乎任何器官都可以通过这种方法生成。

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That means the controversy about using stem cells derived from human embryos is largely absent from this line of research.

CNN: Stem cells may offer promise for damaged hearts