title: Polymorphism of DNA double helices.
mesh_terms: D001482:Base Composition; D001483:Base Sequence; D004247:DNA; D006147:Guanine; D007042:Hypoxanthines; D009690:Nucleic Acid Conformation; D009838:Oligodeoxyribonucleotides / Q000032:analysis; D014961:X-Ray Diffraction
chemical_list: D007042:Hypoxanthines; D009838:Oligodeoxyribonucleotides; D006147:Guanine; D004247:DNA