ValTrendsDB plots showing how the overall validation metrics for protein geometry, as reported in wwPDB VRs, have improved with time. (a) Percentage Ramachandran outliers as assessed by MolProbity (Chen et al., 2010). (b) Percentage side-chain rotamer outliers as assessed by MolProbity. (c) MolProbity all-atom clashscore. Only structures determined by X-ray crystallography were included in the analysis. In each case the box plot shows the inter-quartile range. The red dot marks the weighted arithmetic mean as explained in Appendix A.