Once synthesized, the histones move into the cell nucleus, where a section of DNA wraps around them to form a structure that resembles beads, or knots, on a string.

一旦合成，组蛋白就会进入细胞核，细胞核内的 DNA 片段会将组蛋白包裹起来，形成一种类似串珠或绳结的结构。

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Lungs are more complex than either of these organs, containing several different cell types that form delicate, hairlike capillaries and a maze of branching air sacs.

但是肺的复杂性要超过这两种器官，肺里有几种不同的细胞，要分别形成细微的、头发丝一样的毛细血管，和迂回曲折的分支状的气囊。

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Normal stem cells in the marrow form three main cell-types: Red cells, platelets and white cells.

正常的骨髓干细胞分化形成三种主要细胞类型：红细胞，血小板和白细胞。

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It's no longer capable of self-renewal to form another stem cell.

不再能自我更新,从而生成另一个干细胞了

耶鲁公开课 - 生物医学工程探索课程节选

It's a gene that allows you to deliver a drug that's not active but the gene causes that active - that inactive drug to be converted into an active form that kills the cell.

这一方法利用该基因激活,另一种已经导入细胞的非活性药物,来杀死肿瘤细胞

耶鲁公开课 - 生物医学工程探索课程节选

Dr Michael Seckl, a medical oncologist, and his team at the hospital found that treating cancerous cells with Taxol and stem cell infusion - an advanced form of bone marrow transplantation - was successful.

BBC: 'Women's cancer drug' offers men hope

It seems to be particularly important for the growth and survival of some cancer cells and large amounts of the molecule are often present in the cells of non-small cell lung cancers, sometimes in a mutated, over-active form.

BBC: NEWS | Health | Smart drug for lung cancer tested

This morning, the Food and Drug Administration announced that it had approved the AstraZeneca (nyse: AZN - news - people ) drug for treating advanced cases of non-small-cell lung cancer, which is the most common form of lung cancer in the United States.

FORBES: AstraZeneca's Big Green Light