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Background The genomes of eukaryotes vary enormously in size, with much of this diversity driven by differences in the abundances of transposable elements (TEs). There is also substantial structural and phylogenetic diversity among TEs, such that they can be classified into distinct classes, superfamilies, and families. Possible relationships between TE diversity (and not just abundance) and genome...
The Onychophora (velvet worms) represents a small group of invertebrates (~180 valid species), which is commonly united with Tardigrada and Arthropoda in a clade called Panarthropoda. As with the majority of invertebrate taxa, genome size data are very limited for the Onychophora, with only one previously published estimate. Here we use both flow cytometry and Feulgen image analysis densitometry to...
Numerous theories have been proposed to account for the pronounced differences in the quantity of non-coding DNA among eukaryotic genomes, but the current repertoire remains incomplete because the only explicit mechanisms it provides involve DNA gain. It has been proposed more recently that biases in spontaneous insertions and deletions (indels) can lead to genome shrinkage by mutational mechanisms...
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