Examples of triplet feature patterns rich in the epitopes. The single letters in each colored rectangle is a residue and the double-letter circles stand for contacting residue pairs. Different colors represent distinctive properties of residues. The edges connecting a residue pair and a single residue form interacting residue triangles. For instance, (a) shows a set of residue triangles including QQR, QQN, QQS, QQY, QQK, QQG and QQP that all favor the epitope class.
Zhao et al. BMC Bioinformatics 2012 13(Suppl 17):S20 doi:10.1186/1471-2105-13-S17-S20