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Pyramidalization of backbone carbonyl groups in proteins lacking secondary structure. (a) Absolute pyramidalization of residues receiving an n→π* interaction (blue, n = 896) versus those that do not (red, n = 2863). (b) Pyramidalization of residues receiving an n→π* interaction measured relative to the location of the n→π* donor, with Θ > 0 indicating pyramidalization toward the donor.
