title: Detection and repair of single-strand breaks in nuclear DNA.
mesh_terms: D002499:Centrifugation, Density Gradient; D004247:DNA / Q000032:analysis / Q000528:radiation effects*; D004260:DNA Repair; D004277:DNA, Single-Stranded / Q000032:analysis; D004996:Ethidium; D005720:Gamma Rays; D006367:HeLa Cells; D006801:Humans; D007962:Leukocytes / Q000187:drug effects; D008937:Mitomycins / Q000494:pharmacology*; D009690:Nucleic Acid Conformation; D014466:Ultraviolet Rays; D014983:Xeroderma Pigmentosum / Q000378:metabolism
chemical_list: D004277:DNA, Single-Stranded; D008937:Mitomycins; D004247:DNA; D004996:Ethidium