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. 2001 Apr 10;98(8):4355–4360. doi: 10.1073/pnas.071050698

Figure 5.

Figure 5

Experimental support for the presence of It state in the folding of Cmeso. At the same low concentration of Mg2+ (0.075 mM), the UV and CD spectra of the mesophilic and thermophilic ribozymes are similar. This similarity, shown as difference spectra at 37°C, indicates that an It state is populated in the equilibrium folding of both ribozymes.