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Example sentences for: tsd

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TSD composition and pre-insertion loci
To be classified as an L1-TD, the distance between the end of the L1 3' UTR and the start of the 3' TSD had to be greater than 20 nucleotides (not counting the length of the poly(A) tail preceding the TSD nor the number of nucleotides missing from the end of the L1 3' UTR according to the RepeatMasker annotation of the L1 element).
As seen in Figure 2, the majority of TSDs identified by TSDfinder had high TSD scores (the scoring system is described in Materials and methods), with an average score of 117 out of a maximum possible score of 140.
In determining whether an L1 had inserted into a high-copy sequence, the repeat must be equal to or greater than 75% identical to a reference repeat, and it must extend across the fused TSD/flank sequence for 25 nucleotides in either direction unless the repeat starts or ends elsewhere in the pre-insertion locus.
These L1s had TSDs at least nine nucleotides long preceded by poly(A); they were classified as L1-TDs on the basis of having at least 20 nucleotides of sequence between the end of the 3' UTR and the start of the poly(A) tail that immediately preceded the 3' TSD.