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. 2006 Jul 20;103(31):11539–11543. doi: 10.1073/pnas.0601395103

Fig. 1.

Fig. 1.

FRET efficiency histograms of individual protein molecules at increasing concentrations of denaturant (0–7 M GuHCl). The histograms reflect first unfolding of the protein from its folded to its denatured state, followed by further expansion of the denatured state, which is seen as a gradual shift of the denatured-state distribution to lower values of FRET efficiency.