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. 2001 Feb 13;98(4):1571–1576. doi: 10.1073/pnas.98.4.1571

Figure 4.

Figure 4

The L minus BR (a) and M minus BR (b) difference spectra in the 2,555–2,400 cm−1 region of the wild-type (dotted lines) and the indicated mutant (solid lines) proteins. The sample was hydrated with D2O, and the window tilting angles are 53.5°. One division of y axis corresponds to 0.0015 absorbance unit.