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We analyzed embryonal carcinoma cell lines infected with a recombinant Moloney murine leukemia virus. Lines that carried but did not express the neo gene retained a provirus of LTR-gag-pol-neo-LTR, where LTR is a long terminal repeat, whereas all G418-resistant lines deleted regions that included the primer binding site and the splicing donor site. This suggested the presence of multiple inhibitory elements.

Deletions in a recombinant retrovirus genome associated with its expression in embryonal carcinoma cells