REGULATORY ELEMENTS. “If we imagine that humans and one of the simplest animals, Caenorhabditis elegans, share a nearly equal number of genes (ca. 20,000) it becomes obvious that the elements that create the enormous diversity are not the protein-coding genes but their higher order regulatory network that is processed by the mobile genetic elements, such as transposons and retroposons and the noncoding RNAs” (or viral derived elements).
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