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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.
