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Old 01-14-2010, 11:50 PM   #1
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Join Date: Jan 2010
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Default HELP,why consider reads with 5' adaptor as contaminants?

I got a report about small RNA analysis.It is a Solexa sequencing results.Every read is 35 nt.
It first filter reads without 3' adaptor and then filter reads with 5' adaptor.
Can anybody explain it?Why keep 3' but leave 5'?
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