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. 2017 Feb 11;17(4):427–439. doi: 10.1007/s10142-017-0545-0

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — The RT phylogenetic tree of ERVs in the avian genomes. The nodes of sequences from budgerigar, chicken, medium ground finch, turkey, and zebra finch are shown as blue, red, black, yellow, and green dots, respectively, and the nodes of reference elements are indicated by black triangles. Abbreviation lists of reference endogenous retrovirus: BLV, bovine leukemia virus; HTLV-1, human T-lymphotropic virus 1; FIV, feline immunodeficiency virus; HIV-1, human immunodeficiency virus 1; KoRV, koala retrovirus; PERV, pig endogenous retrovirus; PyERV, python endogenous retrovirus; FeLV, feline leukemia virus; BFV, bovine foamy virus; FFV, feline foamy virus; DrFV-1, Danio rerio foamy virus type 1; MuERV-L, murine endogenous retrovirus-leucine; SERV, simian endogenous retrovirus. The Jule, SURL, and Gmr1 are reference elements of GYPSY/LTR retrotransposons (color figure online)