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Normalized FTIR spectra of the CO-stretching mode bound to HRP in the free form (a) and when complexed to 2-NHA (dashed line) and BHA (solid line) (b) and NMBZA (dash-dot line), BZH (dashed line), and BZA (solid line) (c). Structures and abbreviations of the substrates used in this study are shown in the appropriate places.
