Figure 2
From: Inferring homologous protein-protein interactions through pair position specific scoring matrix
The standard deviations of contact residue potentials in the clusters of amino acid. The deviation > 0.5 is colored by dark gray and the deviation between 0.3 and 0.5 is colored by gray. (A) The amino acid classification is defined by Saha et al. (B) The classification is slightly modified by us.