Secondary structure frequency and accessibility distribution for true motif instances and for random matches. 3a) Boxplots representing the accessibility distributions of true motif instances (orange) and of random matches (yellow), calculated for all motif positions (all positions), non-wildcard positions only (non-wildcard) and wildcard positions only (wildcard). The solid box lower and upper bounds represent the 25th and 75th percentile, respectively. Circles represent outliers; 3b) frequencies of each secondary structure element type in true motif instances and in random matches, calculated for all motif positions, for non-wildcard positions only and for wildcard positions only.
Via et al. BMC Bioinformatics 2009 10:351 doi:10.1186/1471-2105-10-351