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Infection of rat fibroblasts with early mutants of polyoma virus (tsa) or simian virus 40 (tsA30) leads to the establishment of either temperature-independent A transformants or N transformants temperature-sensitive for the expression of the transformed phenotype. The choice between the A- and N-transformed states is not only dependent, as we reported previously (Rassoulzadegan et al., j. Virol., 28:421-426, 1978), on the growth conditions after infection, but is also a function of the multiplicity of infection (MOI); high MOI led to the predominant occurrence of A derivatives, and lower MOI led to that of N transformants.

journal of virology

Transformation of rat fibroblast cells with early mutants of polyoma (tsa) and simian virus 40 (tsA30): occurrence of either A or N transformants depends on the multiplicity of infection