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Thermodynamic stability of hFLeu substituted α4 proteins. (Top) GuHCl induced unfolding of α4 proteins followed by circular dichroism at 222 nm, protein identities are listed in the center. (Bottom) Cartoons illustrating the packing of α4 proteins with Leu as tan spheres and hFLeu as green spheres. Fluorination greatly increases protein stability, ΔΔGunfold (kcal/mol/hFLeu residue) shown as increasing from left to right.
