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We have constructed a dl884/tsA58 double mutant and a t+T- early-region deletion mutant and have used these mutants to study the roles of the simian virus 40 tumor antigens (T and t) in transformation. Our major conclusions are that (i) although the mutant tsA58 is not temperature sensitive for the maintenance of transformation, the dl884/tsA58 double mutant is; (ii) small t antigen can provide at least one, but not all, of the functions required for the maintenance of transformation; and (iii) at least two different functions are required for the maintenance of simian virus 40 transformation.

A simian virus 40 dl884/tsA58 double mutant is temperature sensitive for abortive transformation