Cover: Stereo image showing four superimposed NMR models of a peptide/RNA complex (PDB code 1BIV). Colored MolProbity validation flags draw attention to probable modeling errors: Ramachandran and rotamer outliers (green, gold), Cbeta deviations (lilac), suspicious RNA sugar puckers (magenta), and all-atom steric clashes (hot pink spikes). For more details, see Davis et al. (2007) Nucleic Acids Res., 35, W375-W383.
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