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Proposed packing mode for antiparallel out‐of‐register amphipathic Ac‐X1KFEFKFE‐NH2 and Ac‐ (X1,5KFE)2‐NH2 peptides with tryptophan (Trp) and biphenylalanine (Bip) substitutions at position 1 (X1) or at positions 1 and 5 (X5). As shown schematically in this diagram, the position 1 substituents are unpaired cross‐strand whereas the position 5 substituents are self‐paired
