Up to the sixth passage, the cells lost their proliferation ability.

至第六代，细胞已失去增殖能力。

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Some of the cells have the potential ability of proliferation.

但并不是所有的细胞都具有增殖能力。

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Some of the cells have the potential ability of proliferation.

但并不是所有的细胞都具有增殖能力。

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