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Representative structures of the proteins we studied here: (A) WW domain (PDB: 1I5H (33)), (B) villin (PDB: 1QQV (37)), (C) NTL9 (PDB: 1DIV (39)), (D) Im7 (PDB: 1AYI (38)), (E) titin I27 (PDB: 1TIT (35)), (F) TNfn3 (PDB: 1TEN (36)), (G) PDZ domain (PDB: 1GM1 (40)), (H) α-lactalblumin (PDB: 1HFY (41)), (I) IFABP (PDB: 1IFC (34)), and (J) OmpA (PDB: 1QJP (90)). To see this figure in color, go online.
