nuclei isolated from ehrlich ascites tumor cells which had been exposed to beta-interferon produced in vitro more 202 specific rna than nuclei from control ehrlich ascites tumor cells : an increase in this production was detectable 2 hr after beginning the exposure of the cells to 1000 units/ml of beta-interferon and the increase reached its maximal level , around 18-fold , after 18 hr exposure .
C0007610
nuclei
C0007634
the