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The pH-dependence of the NMR chemical shift for titratable groups in proteins often deviate from a standard Henderson–Hasselbalch (HH) titration curve. A non-HH dependence of the chemical shift for a given residue can arise from a single-site, non-HH titrational event for that residue, or if the chemical shift of the group is influenced by additional titrational events occurring in other residues...
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