Figure 4.
Distribution of LINE clades among vertebrates. The presence and absence of the representative LINE clades are shown with a plus and minus sign, respectively. (a) These mammalian LINEs are not active at present, and only fossil sequences are found. (b) RTE and Vingi are distributed only in restricted eutherian groups, possibly because of horizontal transfer events. (c) R2 elements are not reported in anole lizard but are known in turtle and bird genomes.
