title: Hyaluronic acid: structure of a fully extended 3-fold helical sodium salt and comparison with the less extended 4-fold helical forms.
mesh_terms: D001665:Binding Sites; D006820:Hyaluronic Acid; D008433:Mathematics; D008958:Models, Molecular; D008968:Molecular Conformation; D011487:Protein Conformation; D012964:Sodium; D014961:X-Ray Diffraction
chemical_list: D006820:Hyaluronic Acid; D012964:Sodium