Fig. 3From: Deltaretroviruses have circulated since at least the Paleogene and infected a broad range of mammalian speciesTimeline of deltaretrovirus evolution. A time-calibrated phylogeny of selected mammalian species were obtained from TIMETREE website (http://www.timetree.org/). Occurrence of either endogenous or exogenous deltaretroviruses in the species is indicated next to the species names. Estimated endogenization time intervals are deduced from positivity/negativity of related species for particular ERV integrations. Dashed line indicates the minimal time estimate of deltaretrovirus origin. Closed circles on nodes represent the existence of taxon rank namesBack to article page