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Abstract
Rat 3Y1 cells expressing simian virus 40 large T antigen under the control of the mouse mammary tumor virus long terminal repeat were established. The amount of c-Ha-ras mRNA in those cells was elevated by about 20 times in parallel with large T antigen after exposure to dexamethasone for 48 h. In chloramphenicol acetyltransferase assays with a plasmid containing the c-Ha-ras-1 promoter the increase in c-Ha-ras mRNA was shown to occur at the transcriptional level.