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The net orientation of nicotinic acetylcholine receptor transmembrane α-helices has been probed in both the activatable resting and nonactivatable desensitized states using linear dichroism Fourier-transform infrared spectroscopy. Infrared spectra recorded from reconstituted nicotinic acetylcholine receptor membranes after 72h exposure to 2H2O exhibit an intense amide I component band near 1655cm−1...