Facultative heterochromatin is the heterochromatin that may become transcriptionally active in specific cell development fates.

兼性异染色质是在特定细胞发育命运中可能具有转录活性的异染色质。

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The new field depends on capturing master proteins called transcription factors that control which sets of genes are active in a cell and thus what properties the cell will possess.

这一新研究领域依赖于获得被称作转录因子的主蛋白质，这种蛋白质控制细胞中哪组基因被激活，从而也就控制了细胞拥有哪些特性。

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Though most cells in any individual have the same set of genes, not all of these genes are active in any given cell.

尽管一个个体的大多数细胞都有同一套基因组，但是在每个细胞里不是所有的基因都起作用。

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Then that--those active forms are released from the cell.

然后,那些活化病毒从细胞中释放出来

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

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

For a T cell to become active, it must receive signals from another part of the immune system called an antigen-presenting cell.

ECONOMIST: Breaching the body's defences

The studies excluded patients who had received prior B-cell targeted therapy or intravenous cyclophosphamide, and those who had active lupus involving the kidneys or central nervous system.

FORBES: Human Genome Sciences' Benlysta Approved To Treat Lupus