It was found that at each doubling in a significant fraction of cells, the distribution of DNA between sister cells is asymmetric.

结果发现在细胞的重要部分每一份的倍增，其DNA在两个子细胞中的分配是不对称的。

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The donor can be a brother or sister. Or the donor can be another person with stem cells that "match" the patient's.

干细胞供者可以是患者的兄弟姐妹，也可以是与患者配型相符的其他人。

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Soon after birth, special cells were collected from their new son's umbilical cord and last month, transfused into his sister to help restore her damaged system.

ECONOMIST: Gene genies