Distribution of repetitive elements in phastCons sequences. PCSs that contain at least 1 bp of a repetitive element were summed up in categories according to the first overlapping repeat. The most prominent enrichment is that of PCSs overlapping with LINE-1 repeats (L1, red) in the intergenic regions of imprinted genes relative to the autosomal genome. MER: medium reiteration frequency repeats; MIR: mammalian-wide interspersed repeats; LTR: long terminal repeats; low compl./simple: low complexity regions and simple repeats; L2: LINE-2 repeats.
Hutter et al. BMC Genomics 2010 11:649 doi:10.1186/1471-2164-11-649