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Hydrogen bonding in the E–F loop of wild-type β2m. Amino acid side-chains in the E–F loop (red) which are involved in hydrogen bonding are shown as sticks and colored by element: oxygen (red), nitrogen (blue), hydrogen (white). Polar contacts between atoms are shown as dashed yellow lines. D76 is annotated with a black arrow. The C terminus has been hidden for clarity. PDB: 2XKS.42
