Fig. 1: Reported structures of bicyclic peptides targeting αvβ3.
From: Identification of an αvβ3-targeting bicyclic peptide with atypical norArg-Gly-Asp sequence

a RGD4C and b CLIPS peptide CT3HPQcT3RGDcT3. c Design strategy of bicyclic peptides in this study; R* corresponds to Arg, norArg, and homoArg; G# corresponds to Gly, βAla, and GABA.