[en] The assignment of amide resonances in the two-dimensional PISEMA (Polarization Inversion with Spin Exchange at the Magic Angle) spectrum of uniformly ¹⁵N labeled M2 peptide corresponding to the channel-lining segment of the acetylcholine receptor in oriented phospholipid bilayers is described. The majority of the resonances were assigned through comparisons with spectra from selectively ¹⁵N labeled recombinant peptides and specifically ¹⁵N labeled synthetic peptides. Some resonances were assigned to specific amino acid residues by means of homonuclear ¹⁵N spin-exchange spectroscopy. A modification to the conventional spin-exchange pulse sequence that significantly shortens the length of the experiments by combining the intervals for ¹⁵ N spin-exchange and ¹H magnetization recovery is described