Abstract
We constructed a tsB4/dl884 double-mutant helper virus and used it to isolate two simian virus 40 early region deletion mutants that lack about half of the DNA sequences normally used to encode the large tumor antigen (T). Both mutants make a normal-sized small t antigen, but neither mutant can replicate its DNA in the absence of a T+ helper.
Publisher
American Society for Microbiology
Subject
Virology,Insect Science,Immunology,Microbiology
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