title: Apparent "double mutation" induced by gamma rays.
mesh_terms: D000818:Animals; D003588:Cytopathogenic Effect, Viral; D004770:Enterovirus / Q000528:radiation effects*; D005455:Fluorescent Antibody Technique; D000882:Haplorhini; D009154:Mutation / Q000528:radiation effects*; D009500:Neutralization Tests; D011831:Radiation Genetics; D013552:Swine; D013950:Thymus Gland / Q000382:microbiology*; D014776:Virus Cultivation