High electrostatic similarity of S3-S1-S3' stretches apart from gelatinases subfamily. (a) Heat map relative to the pairwise electrostatic distances for S3-S1-S3' analysis. Colours ranging from red to blue indicate shifts from high to low similarity values. (b) Spy plot of the similarity values lower than 0.93; those greater than the threshold were dropped to zero.
Giangreco et al. BMC Bioinformatics 2010 11:500 doi:10.1186/1471-2105-11-500