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Exact(9)
Identical LTRs imply that the elements have inserted recently and have not had time to accumulate mutations between LTRs.
The LTR retrotransposon has 227-bp LTRs and shares 99% identity (with only a 2-nucleotide difference), indicating that it was inserted recently.
Potentially, the rRNA spliceosomal introns offer three major advantages over pre-mRNA introns that are relevant to understanding intron spread: 1) the rRNA spliceosomal introns have been inserted recently within the Euascomycetes [ 11, 12].
For example, ten out of the 44 identified rooA elements in D. erecta have identical LTR sequence, and may have, therefore, been inserted recently, but the oldest element is already approximately 4.1 myr old.
This recent activity is also reflected in the analysis of pairwise divergence between Expander elements (fig. 3), which shows a distribution shifted toward low values (<5%), suggesting that the vast majority of Expander elements have inserted recently in this genome.
In two of these sequences, the 3' and 5' LTRs are identical (Additional File 5), indicating that they have inserted recently and have not had time to accumulate mutations between the LTRs.
Similar(51)
Although some elements inserted relatively recently, the mean insertion age of the isolated retroelements is around 18 million yrs.
Instead, D'Antoni inserted the recently signed Jonathan Bender, who had not appeared in an N.B.A. game in more than four years.
PID rates were lower among women who had IUDs inserted more recently [ 9].
All isolated elements were inserted relatively recently, especially those belonging to the Gypsy superfamily.
Many of these TEs may have inserted quite recently and are not expected to be at high frequency.
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