Fig. 5

Redundant-TC/redundant-AG (r-TC/r-AG) motifs in LINE-1s (L1s) and LINE-2s (L2s) on opossum, mouse, and human X chromosomes. a Proportions of r-TC (light blue)/r-AG (red) motifs occupied in randomly selected L1s (see Additional file 5) and L2s of various lengths on the X chromosome in the three species. The total numbers and proportions of the L1s and L2s and the average proportions of the motifs are indicated at the top and right of each graph, respectively. b r-TC/r-AG motif–length distributions in L1s of the indicated length ranges (bp) obtained from (a). L1s ≤100 bp of the three species and human L1s of 101–200 bp were fewer than 50 in number because of the lack of both r-UC and r-AG motifs. Maximum length (Max.) and average proportion of the r-TC/r-AG motifs in the L1s are indicated in each graph. Kolmogorov–Smirnov (KS) distance values (vs. 6,001-7,000 bp) are indicated at the bottom and the graphs with KS distance < 0.100 are dark-colored. nt, nucleotides