Exact(2)
To test for these conditions, the unused reads were compared to nr database (the largest nucleotide database available through NCBI BLAST).
To determine the suitability of this species for such studies, polymorphism and recombination estimates are presented for D. americana based on the largest nucleotide sequence polymorphism data set so far analyzed (more than 100 data sets) for this species.
Similar(57)
After this initial screen to identify sequences with similarity to viral genomes, the subset of sequences identified was aligned to the larger nucleotide and translated amino acid sequence databases [ 40], which include entries from a more comprehensive set of organisms.
We find the positions with largest nucleotide frequency increase in the A segment of the second 16S eigenorganism to be enriched in unpaired adenosines, which are exclusively conserved in the Eukarya excluding the Microsporidia (Figures S7 and S8 in Appendix S1), whereas the positions with largest decrease include all 50 unpaired adenosines exclusively conserved in the Bacteria (Figure 4).
In the gap segment of the 16S fifth eigenorganism, the 100 positions with largest nucleotide frequency increase include seven of the 14 unpaired A nucleotides exclusively conserved in the Archaea, implying that these seven unpaired adenosines are exclusively missing in the Microsporidia (Figure S13 in Appendix S1).
Consider for example the 124 positions with largest nucleotide frequency increase in the gap segment of the second most significant 16S eigenorganism, i.e., the positions for which the frequency of gaps across the organisms is most correlated with the second eigenposition.
The 100 positions with largest nucleotide frequency decrease in the A nucleotide segment of this eigenorganism include all 14 unpaired A nucleotides exclusively conserved in the Archaea (Figure S14 in Appendix S1).
Strikingly, only five of the 609 largest nucleotide-level mRNA clusters (those with ≥100 sequences) had an observed match in any of the DNA metagenomes.
According to our previous analyses [ 6, 7], we examine 20 neighboring sites immediately adjacent to each SNP: 10 sites at the 5' side and 10 sites at the 3' side, because these 20 sites have the largest neighboring-nucleotide biases.
On the other hand, introns are a part of the genome with large nucleotide variability and, at the same time, they can be easily amplified with primers placed in the adjacent exons [ 20, 22, 23].
Nine direct repeats were observed greater than 13 nucleotides; the largest was 17 nucleotides, i.e. GGCGGCATCCAACTCGG repeated at positions 34076 and 34120.
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