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. 2020 Jun 2;9:4. doi: 10.1186/s13619-020-00046-4

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Retrotransposon classification. A tree diagram of transposons. Well-known classes and subclasses are listed, and mouse/human specific families are highlighted. Transposons are divided into two classes by the type of transposition. Retrotransposons are classified into two types according to the encoding transposase. ERVs are the most popular elements studied in LTRs. In LINE1 subfamilies, L1MA4–1 and L1PB3–1 are already extinct, and L1PA evolved as a single lineage