title: Helical channels in crystals of gramicidin A and of a cesium--gramicidin A complex: an x-ray diffraction study.
mesh_terms: D002586:Cesium; D003461:Crystallography; D006096:Gramicidin; D008968:Molecular Conformation; D014961:X-Ray Diffraction
chemical_list: D006096:Gramicidin; D002586:Cesium