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Effect of ribonucleases on the proliferation in culture of K-562 cells. Proliferation was measured by incorporation of [methyl-3H]thymidine into cellular DNA after a 44-h incubation with the ribonucleases. Values reported are the mean from three cultures and are expressed as a percentage of the control, which is the mean from cultures lacking exogenous ribonuclease. The standard error of each value is <11%.
