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In order to study the secondary structural preferences of amphipathic cyclopeptides in detergent assemblies and their interactions with metal ions, two basic amphiphatic cyclooctapeptides, c[(Lys-d-Lys) 2 -Xaa-d-Leu-Leu-d-Leu], where Xaa is Leu (P1) or Trp (P2), were studied by circular dichroism (CD) spectroscopy. In water, P1 exhibited an unordered secondary structure whereas P2 adopted...