Transposons
Mobile elements Transposons are mobile DNA elements which inserted themselves into the human genome during the evolution. So it is common to refer to them as transposon insertions. Transposons arise from RNA-based or DNA-based mechanisms and are therefore categorized in two classes: retrotransposons and DNA transposons. Retrotransposons Retrotransposons are fragments of cDNA which are transcribed from RNA