Example lincRNAs with TE annotations. lincRNA exons are drawn above in blue, with introns colored lighter. TEs are colored by family, matching the legend in Figure 1a. (a) TUG1 serves as a typical example of a lincRNA containing multiple TE families. (b) Alternatively, HOTAIR and 1,531 (17%) of the lincRNAs in our catalog are devoid of TEs. (c) Linc-ROR is almost entirely composed of TEs, including its TSS in the LTR of a HERVH element. (d) BC026300 also initiates transcription in a HERVH. The images were created using the software AnnotationSketch .