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. 2009 Oct 22;7:69. doi: 10.1186/1741-7007-7-69

Figure 2.

Figure 2

Major ionisation zones in the pH-dependence of protein stability. A schematic diagram of the major ionisation regions in a plot of folding stability (ΔGFU) versus pH. Properties describing this pH-dependence, in the notional case of no protein unfolding over the pH range, are shown. Cysteine and tyrosine have been omitted from this figure since they are mostly unionised at physiological pH.