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(A) Van der Waals packing interactions formed by the three intermolecular H-bonds around W169E2 at the Site2 interface of the wt-hGH–hGHR ECD ternary complex. The hGHR residues are labeled in red. (B) Superimposed diagram showing the interactions of D116 in the wt-hGH–hGHR ECD complex (green) and of the Site1 phage displayed optimized hGHv–hGHR ECD complex (yellow; Schiffer et al. 2002). The arrow depicts the peptide bond flip of W169E2 between the two crystal structures.
