title: Isolation and physical mapping of nitrogen fixation genes from the cyanobacterium Anabaena 7120.
mesh_terms: D001483:Base Sequence; D003001:Cloning, Molecular; D000458:Cyanobacteria / Q000235:genetics*; D004262:DNA Restriction Enzymes; D004251:DNA Transposable Elements; D005796:Genes; D008854:Microscopy, Electron; D009586:Nitrogen Fixation; D009693:Nucleic Acid Hybridization
chemical_list: D004251:DNA Transposable Elements; D004262:DNA Restriction Enzymes