Fig. 1.

Presence and coverage of L1 and BovB elements across eukaryotes. The Tree of Life [59] was used to infer a tree of the 759 species used in this study; iTOL [58] was used to generate the bar graph and final graphic. The black arrow marks the proposed L1 HT event into therian mammals 160–191 MYA. Branches are coloured to indicate which species have both BovB and L1 (green), only BovB (orange), only L1 (blue) or neither (black). Bar graph colours correspond to BovB (orange) and L1 (blue). Connections indicate possible HT events involving BovB (yellow) or L1 (red) elements. An interactive and downloadable version of this figure is available at: http://itol.embl.de/shared/atma