This spongy tissue serves as a source of calcium for eggshell formation.

这种海绵状组织是形成蛋壳的钙质来源。

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The cells are "the first unlimited source of any type of human tissue," says Thomson, who founded Cellular Dynamics to put stem cells to practical use.

这些细胞“首先是任何类型人体组织的无限来源，”Thomson说，他创立了Cellular Dynamics以推动干细胞的实际应用。

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The cells are "the first unlimited source of any type of human tissue, " says Thomson, who founded Cellular Dynamics to put stem cells to practical use.

这些细胞“首先是任何类型人体组织的无限来源，”Thomson说，他创立了Cellular Dynamics以推动干细胞的实际应用。

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Dr Frisen reckons that they may offer several advantages over human embryonic stem cells which, although easier to manipulate, are a controversial source of new tissue because they are still mainly obtained from aborted fetuses.

ECONOMIST: Stem cells

The issue of cloning and embryonic stem cell research intersect when it comes to possible uses of cloned tissue as a source of stem cells.

CNN: House poised to consider human cloning

As the source of every cell, tissue and organ in the body, their medical application has the potential to repair damaged tissue, regrow internal organs and cure currently incurable diseases like cystic fibrosis, Alzheimer's and Parkinson's.

CNN: You, again: Are we getting closer to cloning humans?