Such endoreduplication provides a mechanism for producing extra gene copies.

这种内复制提供了产生额外的基因复制的机理。

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By deleting the enzyme-producing gene, the scientists believe that they caused the female mice to be exposed to extra oestrogen, by preventing their brains from filtering out the hormone.

通过敲除这种能够产生酶的基因，科学家认为他们可以通过阻止雌性老鼠大脑过滤掉激素，使雌性老鼠受到额外的雌激素的影响。

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Mice bred to have extra copies of the rogue gene were healthy but ate more and became heavier than normal rodents.

经培养带有多余流氓基因的老鼠很健康，但是比正常老鼠吃得多，也更重。

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This will be done by adding extra copies of the gene using a mouse leukaemia virus modified to ensure it does not trigger cancer.

BBC: 'Brain cell transplant' for Alzheimer's

By combining the gene test for BRCA1 and BRCA2 with this extra genetic information, women who have a high number of the newly identified markers could find they have a nearly 100% risk of getting breast cancer.

BBC: DNA test reveals 80 markers for inherited cancer risk