Figure 1.
The relationship between the age of L1 families and the phylogeny of humans, chimpanzees, and macaques. The age range of the six different L1 families (gray rectangles) was estimated from their divergence relative to the divergence time of humans (H), chimpanzees (P), and macaques (M) as described in the Methods. The extended limb of the gray rectangle for the L1Pa2 family indicates that this L1 family is still active in chimpanzees but went extinct in humans sometime after the chimpanzee/human divergence. The 4–7 Myr range of the estimate for this divergence (see Methods) is shown on the phylogenetic tree. (Double-headed arrows, T2–T7) Times between the mean age of each L1 family and the mean of the time of the chimpanzee/human divergence (see Methods). (Red arrow, Tall) Time from the mean of the chimpanzee/human divergence to the present. The divergences between the chimpanzee and human ortholog pairs include only the nucleotide changes that occurred during the Tall interval.