Figure 4
From: Epigenetic histone modifications of human transposable elements: genome defense versus exaptation
Age of Alu and L1 elements versus their histone modifications. Relative ages of Alu (a) and L1 (b) subfamilies, as determined by divergence from subfamily consensus sequences, are plotted against their respective tag counts normalized by genomic length. Spearman rank correlations (ρ) between tag counts and percent divergence are shown for active (red) and repressive (green) modifications separately (significance values are in Additional file 1, Table S4).