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The idea is to test whether adding more sequences to a native alignment can help homology detection.
The addition of more sequences to the phylogeny had no effect on the bootstrap support for the key nodes and did not change the topology of the tree.
The authors added four more sequences to their alignment and claim that Giardia is the only organism in which the arginine is functionally substituted by a lysine.
The number of clusters shows the same trend, because the similarity threshold decreases with the number of mismatches allowing more sequences to be assigned to clusters.
The time requirements decrease with increasing threshold values of QV constraints, because greater threshold values tend to assign more sequences to clusters in each pass.
For example, LCA assigned 25 times more sequences to the 'cellular organisms' level than did SPANNER on the KB-1 metagenome but had fewer assignments to 'other' taxa (i.e. those not expected to occur in KB-1).
Similar(49)
Obviously, a factor that binds more diffusely, such as some histone marks, will need more sequence to reach saturation.
Simple (including satellite) repeats and rRNA sequences also contribute more sequence to the germline than somatic genomes, but these repeats comprise very small proportions of both genomes.
As a result, we obtain a maximum set of sequences in which there is no more sequence to be incorporated at a certain number of subgroups.
However, shotgun sequencing is more complex to analyze, owing in part to the challenge of distinguishing between host and bacterial genomic material, and requires far more sequencing to be performed.
Although adding more sequence to an SHS experiment increased the genotype determination rate, there were still a number of bases with little or no sequence coverage, likely due to poor capture.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com