title: A double-stranded beta-helix with antiparallel chains in a crystalline oligo-L-D-peptide.
mesh_terms: D003461:Crystallography; D007476:Ionophores; D008961:Models, Structural; D009842:Oligopeptides; D011487:Protein Conformation; D014961:X-Ray Diffraction
chemical_list: D007476:Ionophores; D009842:Oligopeptides