Fig. 6

K-means clustering illustrates the diversity of expression profiles among sncRNAs. Total expression (log of normalized expression) of each sncRNA class was plotted as heat maps on the left panel, showing the sncRNA expression from PAR to SPZ (x-axis) per cluster (y-axis). Clusters are grouped according to the region of highest expression: clusters 1–4 gather sncRNAs whose expression peaks at PAR , cluster 5 at CAP , clusters 6–9 at COR , clusters 10–11 at CAU and clusters 12 at SPZ . The proportion (%) of cluster expression attributable to each sncRNA class is provided as a bar chart on the right panel