Proportion of binding sites versus proportion of motifs for individual classes. For each of the 17 transcription factors, the proportion of binding sites in each mosaic class has been plotted against the proportion of motifs found in this class. The preferred classes have been plotted in red and the other classes in blue. As there are 19 pairs of classes, (4 pairs of preferred classes and 15 pairs of non-preferred classes), each transcription factor contributes 8 red points and 30 blue points to the graph. There is a correlation between the variables (Spearman coefficient = 0.68), but this comes from the mass of points near the x-axis, so that the proportion of motifs is not a useful predictor of the proportion of sites. Not plotted is a red point outlier at (0.01, 0.62).