elncRNA and plncRNA loci tend to show different origins and are associated with different transcriptional properties. (A) Density of transposable element (TS)-derived sequence in elncRNA (green) and plncRNA (blue) exons. (B) elncRNAs (median (elncRNAmaxTS) = 0.41) tend to be more tissue-specific (two-tailed Mann–Whitney test, P < 5 × 10-11) than are plnRNAs (median (plncRNAmaxTS) = 0.22). (C) elncRNAs (median FPKM, (elncRNAexp) = 0.43) tend to be more lowly expressed in erythroblasts than are plncRNAs (median FPKM, (plncRNAexp) = 0.64, two-tailed Mann–Whitney test, P < 0.001). ***P < 0.001. FPKM, fragments per kilobase of sequence per million reads.
Marques et al. Genome Biology 2013 14:R131 doi:10.1186/gb-2013-14-11-r131