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The 13C-ASRK minus 13C-ASR (a) and the AT-ASRK minus AT-ASR (b) spectra (pH 7) in the 2,750–2,520 cm-1 region measured at 77 K. Sample was hydrated with D2O (red line) or D218O (blue line). Green-labeled frequencies correspond to those identified as water stretching vibrations. One division of the y-axis corresponds to 0.0004 absorbance units. This figure is reprinted with permission from Kawanabe et al. [59]. Copyright 2006 American Chemical Society.
