(2) Retrotransposase domains Retrotransposon gag (IPR005162) is the retrotransposon gag domain. When it comes to speed and accuracy, transposable elements (TEs) are better at helping with chromosomal rearrangements than other cellular processes. Longitudinal repeats surround retrotransposons, which share structural similarities with retroviruses. This entry refers to eukaryotic Gag or capsid-associated retrotransposon-related proteins, like Mus musculus's PEG10, which comes from a retrotransposon. This protein self-assembles into a virion-like capsid by binding its own mRNAs. The central motif QGXXEXXXXXFXXLXXH is frequent in gag proteins of the Retroviridae family, but it is inadequately conserved.