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Why the limit of the number of ns allowed in an assembled sequence?

April 26, 2017allowed assembled limit sequence

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Why the limit of the number of ns allowed in an assembled sequence?

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The number of n’s in a row must be less than 15. The assembled sequnce cannot have more than 10% n’s. The reason for the limits is that an extended string of n’s in the sequence from the new sequencing technologies usually indicates a bad read.