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Experimentally observed pressure sensitivity of aromatic ring motion in ubiquitin above and below the thermal transition temperature for ring flipping. Lipari-Szabo model-free squared generalized order parameters of the C5-H ring bond vectors of Tyr-59 (■), Phe-4 (◆) and Phe-45 (●) determined by 13C-relaxation at 283 K (blue symbols) and 323 K (red symbols).
