What did this year’s winners of the Nobel Prize in medicine discover?

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The co-winners of the 2006 Nobel Prize in physiology or medicine are two U.S. scientists who discovered a process called RNAi, which stĀ­ands for RNA interference. They essentially found a more effective way of achieving a gene-silencing effect that had been observed in plants for years.

from Pocket http://science.howstuffworks.com/environmental/conservation/issues/nobel-prize-rnai.htm
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