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Crystal structure for molecule A of native alamethicin ((36); PDB: 1amt) with the TOAC structure from molecule B of Z-TOAC-(L-Ala)2-NHtBu (45) substituted for Aib at residue position 1, 8, or 16 (8). The alamethicin molecule is oriented with the axis of the longer helix perpendicular to the plane of the figure and the N-terminus faces upward from the plane of the figure.
