Figure 3

The length and tag-depth distributions of TCs of different categories. TCs overlapping 4 different classes of small ncRNA are plotted on top of all unannotated TCs. TCs comprising grey bars in Fig. 2 are coloured, and they differ in the length and tag-depth according to their corresponding ncRNA classes. While TCs derived from two different classes of snoRNAs have similar range of tag-depths, the TCs of box H/ACA snoRNAs (purple) are much longer than those of box C/D snoRNAs (red). tRNA-derived TCs (blue) overlap the size range with TCs of box C/D snoRNAs but tend to be deeper in tag-depth than box C/D snoRNA-derived TCs. TCs derived from miRNA loci are shown in green and show a wide range of tag-depths. Those spanning precursor miRNAs are scattered within the size ranges of box C/D snoRNAs or tRNAs, but have much greater tag-depths. The dashed boxes around the TCs for box C/D and box H/ACA snoRNAs show the areas within which box C/D and box H/ACA snoRNA candidates were searched for.