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Structure of the cationic amphiphilic polyproline helices (CAPHs) composed of unnatural proline-based amino acids in (a) monomeric and (b) dimeric forms. Hydrophilic residues are shown in blue and hydrophobic residues are shown in pink. The fluorescein moiety is depicted in green, the spacers are highlighted with a blue circle and the linker is shown in orange.
