Abstract

The effect of L-cell interferon (IFN) preparation on the survival times of mice implanted with two different clones (T-22 and R-4) of mouse myeloid leukemic MI cells were examined. T-22 cells, but not variant R-4 cells, can be induced to differentiate in vitro or in vivo into macrophages and granulocytes. In vitro growth of R-4 cells was markedly suppressed by IFN, but that of T-22 cells was resistant to IFN. The survival times of mice with implanted T-22 cells were prolonged by treatment with IFN but those of mice with implanted R-4 cells were not.

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