title: DNA before Watson--Crick.
mesh_terms: D001483:Base Sequence; D004247:DNA / Q000266:history*; D004739:England; D006666:History of Medicine; D008967:Molecular Biology / Q000266:history; D008970:Molecular Weight; D009690:Nucleic Acid Conformation; D014170:Transformation, Genetic
chemical_list: D004247:DNA