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Two experimental structures of the villin helical subdomain, showing only the backbone (ribbons) and heavy atoms for the 3 phenylalanines in the core (F47, F51 and F58). The NMR structure of HP36 (pdb code -1VII) is colored blue and the X-ray structure (pdb code – 1YRF) is colored yellow. Differences in the backbone and the phenylalanine core packing are highlighted using a best fit alignment on the backbone residues L62 to F76.
