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. 2018 Nov 20;19(11):3653. doi: 10.3390/ijms19113653

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Main features of the Rex1 retroelement (A/P*, apurinic/apyrimidinic site that can be located upstream or downstream the RT-encoding region; RT, reverse transcriptase-encoding region; 3′UTR), Rex3 (EN, endonuclease-encoding region; TSD, target site duplication; RT, reverse transcriptase-encoding region; Ct, C-terminal domain–encoding region; tail consisting of tandem repeats of the sequence GCG (GAA)2 (GATG)n, where n = 8–17 [35], and Rex6 (RT, reverse transcriptase-encoding region; EN, endonuclease-encoding region).