Abstract
The structure of a newly and independently isolated defective variant of simian virus 40 that contains covalently linked monkey and SV40 DNA sequences is described. This variant, termed 290, has a structure essentially identical with a previously isolated and characterized variant named CVP8/1/P2 (Eco RI res). The structural similarities include the monkey (host) DNA segment that is combined with viral DNA sequences, the particular viral DNA segment that is present, and the arrangement of these within the defective genome. The monkey DNA segment contains sequences derived from both low and high reiteration frequency monkey DNA. The viral sequences include the origin of replication. The separate isolation of essentially identical variants suggests a high level of specificity in the events leading to the formation and amplification of this type of defective genome.
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