exposure of uninfected rat cells in tissue culture to anaerobic culture conditions induces transcription of rna corresponding to the two principal constituents of rat-derived type-c sarcoma virus genomes : ( i ) those specific rat cell sequences present in the kirsten and harvey murine sarcoma virus genomes , and ( ii ) an endogenous type-c rat leukemia virus .
C0040649
transcription
C0035668
rna