Post-hoc comparison of RNA-binding proteins based on iONMF. (left) Hierarchical clustering (Ward’s linkage) of proteins and 20 most common complex motifs, estimated from row vectors HKMER obtained with iONMF. Heatmap shows log odds ratios of observed motif probability in sites proximal to crosslinked sites divided by the expected probability. (right) Protein similarity based on gene region types row vectors in HRG. For each region type, the interval [-50..50] relative to the crosslinked sites is shown.