FOREIGN SPECIES ORIGIN OF HUMAN JUMPING GENES: transposons may be silenced (non-coding) by epigenetic mechanisms, which may have led to the idea that they are “junk DNA”, but this is a misguided idea. “The distribution of (jumping genes) suggests that they might have been generated in a common ancestor of vertebrates and might then have survived in most vertebrates in the genome of a common ancestor about 540 million years ago or even more….””
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