title: HYBRIDS DERIVED FROM THE VIRUSES OF VARIOLA MAJOR AND COWPOX.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D015605:Cowpox; D003594:Cytoplasmic Granules; D006824:Hybridization, Genetic; D007793:Lagomorpha; D009693:Nucleic Acid Hybridization; D011817:Rabbits; D012899:Smallpox; D014616:Vaccinia virus; D012901:Variola virus; D014776:Virus Cultivation
keywords: CHICK EMBRYO; CYTOPLASMIC GRANULES; HYBRIDIZATION; RABBITS; SMALLPOX VIRUS; VACCINIA VIRUS; VIRUS CULTIVATION