Merck is using RNAi technology to switch off genes in lab animals it is using in drug discovery.

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Insert, a subsidiary of Arrowhead Research, is developing the delivery vehicle to carry the RNAi technology of Calandro Pharmaceuticals, another Arrowhead company.

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Insert, a subsidiary of Arrowhead Research (nasdaq: ARWR - news - people ), is developing the delivery vehicle to carry the RNAi technology of Calandro Pharmaceuticals, another Arrowhead company.

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Now a similar sea change may be afoot, thanks to a new technology called RNA interference, or RNAi, which allows scientists to stop a disease by silencing a particular gene.

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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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