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Examples of peptide molecules that do not appear to be justified by the electron density. Shown are electron-density maps for (a) the Crystal structure of the complex formed between phospholipase A2 with β-amyloid fragment (PDB entry 3jti) and (b) the Structure of serine proteinase K complex with a highly flexible hydrophobic peptide (PDB entry 2pq2), both at 1.8 Å resolution. Map parameters and contour levels for all figures are provided in §3.7.
