title: Recombination in Ustilago violacea after liquid nitrogen refrigeration.
mesh_terms: D000483:Alleles; D001487:Basidiomycota / Q000254:growth & development / Q000528:radiation effects; D002470:Cell Survival; D003433:Crosses, Genetic; D005615:Freezing; D005796:Genes; D005827:Genetics, Microbial; D009154:Mutation; D009584:Nitrogen; D011309:Preservation, Biological; D011830:Radiation Effects; D011995:Recombination, Genetic; D012034:Refrigeration; D013172:Spores, Fungal / Q000254:growth & development; D014466:Ultraviolet Rays
chemical_list: D009584:Nitrogen