Eight temperature-sensitive mutants of simian virus 40 which transform rat cells at 32.5 C but not at 38.5 C have been isolated. All the mutants were also temperature sensitive for replication in African green monkey kidney cells and five of them were classified into a single complementation group. No mutant incapable of transforming rat cells at either temperature was isolated.
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Yamaguchi et al. (1975) studied this question.