Abstract
Strains of Ad. 2 and Ad. 12 to which the SV40 gene for T antigen induction was transferred by mixed infection with the Ad. 7-SV40 hybrid strain E46+ also acquired the ability to induce a T antigen of Ad. 7. The determinant for induction of the Ad. 7 antigen is in Ad. 2 or Ad. 12 capsids, is not separable from the SV40 gene by cloning, and like the SV40 DNA, is in defective particles. It is concluded that the SV40 DNA and a portion of Ad. 7 DNA are in the same capsids, and are probably linked.