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1. A transposition of sequences in a DNA that does not originate in the DNA but rather in an mRNA that is transcribed back into the genomic DNA by reverse transcription. Synonym(s): retrotransposon
2. A transposable element.
[retro- + L. pono, pp. positum, to place, + -on]
A transposon copied from RNA with the use of reverse transcriptase.