Interaction graph for residue chain. This figure gives an example of the interaction graph for a protein sequence of seven amino acids. Ci denotes the alpha carbon of the ith residue. Apart from the neighboring relationships, the are two more edges in this map namely (C2, C4) and (C4, C6).
Bhuyan and Gao BMC Bioinformatics 2011 12(Suppl 14):S10 doi:10.1186/1471-2105-12-S14-S10