Genome-wide occurrences of candidate motifs. Most of the candidate motifs with verified biological function are over-represented within upstream regions. Motif density is plotted as number of motifs per 10 kb for each data set - upstream sequences (red) and coding sequences (blue) (Table 2) - on the y-axis for each candidate motif on the x-axis.
Mullapudi et al. Genome Biology 2009 10:R34 doi:10.1186/gb-2009-10-4-r34