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0.004

0.004

0.004

0.004

1

A chromosome is about 0 . 004 mm long. To fit inside , the 4cm piece of DNA is squashed by a factor of 10 000.

一个染色体大约有 0.004 毫米长，要把这段 4 厘米长的 DNA 适当地放进去，需要挤压大约 1万倍的缩小比率。

2

It is a very rare condition though , only affecting 4 out of 100 , 000 men and 2 out of 100, 000 women .

但这是一种非常罕见的情况，只有 0.004%的男性以及 0.002%的女性会出现此类症状。

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