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![[Figure 1]](kk5067fig1mag.jpg)
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Figure 1
Backbone torsion-angle distribution for an improbable peptide. The panel shows a MolProbity plot (Davis et al., 2007  ) of a purported random peptide with only 28% of residues in the favored region, 38% in additional allowed regions and 34% total outliers. The conformational energy of this peptide is extraordinarily high, and it is highly improbable that it can exist in this conformation. In addition (and as a consequence of its improbable geometry), the MolProbity all-atom clash score, a measure for serious steric overlaps, places the peptide into the zeroth percentile (worst) of available reference structure model entries. Reproduced from Rupp (2009) by permission of Garland Science/Taylor & Francis LLC. |
![[Figure 1]](kk5067fig1.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
