Other firms are looking beyond directly blocking VEGF, and are using RNA interference to target other molecules in its signalling pathway, either upstream or downstream.

其它公司不仅仅在考虑直接阻断VEGF，而是尝试通过RNA干扰来瞄准其信号路径中的其它分子，上行或者下行均可。

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A completely different approach is to use RNA interference, a relatively new technique for switching off individual genes by delivering short stretches of RNA.

另一种完全不同的方法是RNA干扰。它采用相对较新技术通过转录小rna分子来关闭各别基因。

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Instead, the naked viral RNA may alter the function of the cells through a mechanism similar to RNA interference, in which the presence of certain RNA sequences can turn genes on and off.

相反，该病毒的裸rna可以通过一个类似rna干扰的机制，改变细胞功能，其中某些RNA序列可以打开和关闭基因。

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Two better-known alternatives, antisense and RNA-interference, the latter of which is being used now by Monsanto, can silence or shut down genes but cannot turn them on or make them louder.

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What's more, later research would reveal that genes that create this kind of RNA--known as RNAi, for RNA interference--existed in plants, fruit flies and even people.

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Sirna has been in the news of late because Andrew Fire and Craig Mello, the discoverers of the technology upon which Sirna's drugs are based--RNA interference, or RNAi-- won a Nobel Prize for medicine last month.

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