Species-specific TE families. A) The genomic contribution of species-specific (rather than ancestral) TE families represented on mouse and human TE-arrays. LTR-based retrotransposons represent the largest class in both species. B) The percentage of total TE-array probes for each species-specific array. In mouse, most probes are long terminal repeat (LTR) based TE sequences; these include intracisternal A particle (IAP) and VL30 elements. Long INterspersed Elements (LINE) probes make up the next largest category, although they comprise relatively fewer probes on the murine array as compared to the human array.