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Ramachandran φ, ψ plots for the pre-Pro case. (a) The reference distribution of 60 000 well determined pre-Pro residues, with contours that enclose the favored 98% of the data (thin green lines) and that exclude the outliers (thick green lines). (b) A pre-Pro Ramachandran plot in the Phenix GUI for a query structure, showing two labeled outliers in red. Note that pre-Pro is very different from a general case Ramachandran plot.
