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Studies on the adenovirus type 2-simian virus 40 (SV40) hybrid population demonstrated two genetically stable variants within this population, which were isolated by plaquing in African green monkey kidney cells. These variants were similar in that each induced SV40 T antigen in human embryonic kidney cells and contained similar concentrations of nonhybrid adenovirus type 2 virions and adenovirus-encapsidated particles containing the infectious SV40 genome. These variants differed markedly, however, in their ability to produce SV40 viral antigen in human embryonic kidney cells and the efficiency with which they produce SV40 plaques in monkey cell monolayers. It is postulated that the differences in SV40-yielding efficiency between these variants lie in the nature of the recombinant deoxyribonucleic acid composing the genome of the hybrid particles.

journal of virology

Isolation of Two Plaque Variants from the Adenovirus Type 2-Simian Virus 40 Hybrid Population Which Differ in Their Efficiency in Yielding Simian Virus 40