Figure 5.

Many RBPs can recognize more than one motif. (Top) Pie chart indicates fraction of RBPs that recognize more than one motif. Primary (left) and secondary (right) motifs are shown, classified according to the RBP structural family. Number next to the RBD name indicates the number of RBDs in the construct used, and the letters indicate how the two motifs are different from each other, as follows: difference in number of half-sites (n), half-site spacing (sp), base recognition (b), and/or secondary structure (3d).