Fig. 7
From: Stable intronic sequence RNAs (sisRNAs) are selected regions in introns with distinct properties
sisRNAs are as evolutionary conserved as introns, but much less than exons. Average PhastCons conservation scores of sisRNAs and introns for upstream and downstream (±150-bps) relative to (a) 5′ end, (b) midpoint, and (c) 3′ end. Boxplots of the comparisons of GC% (d), CpG density (e) and CA|TG density (f) of the human red blood cells (grey), human Hela cells (orange), mouse red blood cells (brown), mouse 3 T3 cells (yellow), chicken DF1 cells (purple), and Xenopus laevis XTC cells (light blue) cytoplasmic sisRNAs, to sisRNAs identified by refSeq (red) and Ensembl (blue) genes. g Venn diagram shows the overlap of host genes with sisRNAs identified by RefSeq genes in Xenopus tropicalis GV and host genes with cytoplasmic sisRNAs in Xenopus laevis XTC