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In the structural mimetics category, we have designed small molecule and macrocyclic scaffolds that mimic the backbone geometry and the projection of side chains as observed in peptide structures at PPI interfaces. The designs cover b-turn / loop mimetics and a-helix mimetics. Since helices present at the interface in 62% of all protein-protein interactions, we have focused on designs including mimics with the substitution geometry of an a-helices, as well as designs that mimic the location of “hot-spot” side chains in helix-mediated PPIs. Epitope mimetics have been designed using structure-based designs focusing on the locations of hot-spot residues at the PPI interfaces.