title: EVIDENCE FOR THE TWO-HIT NATURE OF X-RAY INDUCED CROSSING-OVER IN THE CENTROMERIC REGION OF DROSOPHILA MALES.
mesh_terms: D000818:Animals; D002875:Chromosomes; D004330:Drosophila; D009154:Mutation; D009584:Nitrogen; D010100:Oxygen; D010600:Pharmacology; D011831:Radiation Genetics; D012106:Research; D014965:X-Rays
chemical_list: D009584:Nitrogen; D010100:Oxygen
keywords: CHROMOSOMES; DROSOPHILA; EXPERIMENTAL LAB STUDY; MUTATION; NITROGEN; OXYGEN; PHARMACOLOGY; RADIATION GENETICS