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. 1999 May 25;96(11):6031–6036. doi: 10.1073/pnas.96.11.6031

Figure 3.

Figure 3

PGK at pH 2 has a rapid fluorescence response attributed to relaxation of the unfolded chain (t1 in Eq. 1 at 0.1 μs). Similar <20 μs phases are also observed preceding the folding kinetics of PGK and Ub*G at higher pH. (Inset) Tryptophan has only an “instantaneous” (<20 ns) temperature-dependent fluorescence change (t1 at −25 μs).