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My biotechnology book doesn't explain RNAi and its usefulness very well. I know that it is used to silence certain genes, but how does it do that and what can we do with that?

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Have you looked at the wiki page on RNAi? en.wikipedia.org/wiki/RNAi Its fairly extensive in detail and is a good place to start before delving into scientific literature. – gkadam Jul 3 '12 at 23:41
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I really think this question could be answered by wikipedia, perhaps you could ask specific questions about what you don't understand? – GWW Jul 4 '12 at 2:44
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what can we do with that? Silence genes, of course! :D – nico Jul 4 '12 at 6:15
This question is too broad for this site, feel free to ask more specific questions about the topic here. – Mad Scientist♦ Jul 4 '12 at 8:29

closed as not a real question by GWW, Michael Kuhn, Mad Scientist♦ Jul 4 '12 at 8:28

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.