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Histidine site-specific 2DIR spectra and their diagonal traces of the δδδ, εεε, and πππ tautomers for the 6th, 13th, and 14th amide-I bond of histidine residue. The black, red, and blue lines represent the diagonal traces of the δδδ, εεε, and πππ tautomers, respectively. The green lines represent the three peaks at 1580, 1586, and 1593 cm−1. To see this figure in color, go online.
