他们还对更早期的胚胎细胞进行标记跟踪，以确定移植的细胞如何愈合。

Then they labeled cells in even earlier embryos to track where they wound up.

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他们还对更早期的胚胎细胞进行标记跟踪，以确定移植的细胞如何愈合。

Then they labeled cells in even earlier embryos to track where they wound up.

youdao