Changes in mutations to residue charges. Average changes in mutations to residue charges in α-helices (red), β-strands (blue), turns and bends (green). The thick line indicates the original amino acid charges. Outer rings indicate higher charge values and inner rings lower, in steps of 1.25 pI.
Khan and Vihinen BMC Structural Biology 2007 7:56 doi:10.1186/1472-6807-7-56