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Representative infrared spectra in the amide A and I regions. The spectrum shown corresponds to αM-TM (NSVGG) reconstituted in DMPC bilayers, collected at parallel (solid line) and perpendicular (broken line) polarization. The isotopically labeled residue (L1120) is indicated. The band corresponding to the 13C=18O label is indicated with an arrow, and displayed as an enlarged view.
