Other research in this area has required that cells of one type first be returned to a more generally undifferentiated stem cell state, which can introduce fresh problems.

该研究领域的其他技术都需要先将一种类型的细胞变回到普遍未经分化的干细胞状态，而干细胞才能发生分化。

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CONCLUSION: the relatively pure and undifferentiated limbal stem cells can be obtained by combining non calcium medium and low calcium medium after the basal limbal cell tissues are cultured.

结论：取用角膜缘基底组织进行培养，将无钙培养液与低钙培养基结合，可获得较纯的、未分化的角膜缘干细胞。

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Embryonic stem cells (ES cells) are unique cell populations with the ability of self-renewal, unlimited proliferation, multipotent differentiation and maintaining their undifferentiated state.

胚胎干细胞(ES细胞)具有自我更新、无限增殖、保持未分化状态和向所有三个胚层分化的潜能。

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Embryonic stem cell research involves collecting undifferentiated cells from embryos.

CNN: Dr. Sanjay Gupta: Understanding stem cell research

Embryonic stem cells are "blank" or undifferentiated cells that can develop into any type of cell in the body.

CNN: NIH announces owners of stem cells