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Villin headpiece: (a) the initial fully extended structure, (b) a typical folded structure compared with an NMR reference structure (gray, PDB ID: 1VII, Cα-RMSD: 1.15 Å), (c) a typical folded structure compared with an x-ray structure (gray, PDB ID: 1YRF, Cα-RMSD: 0.47 Å), and the N-terminal is not shown due to the sequence difference.
