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3. Spontaneous neoplastic transformation in vitro: Ultrastructure of transformed cell strains and tumors produced by injection of cell strains;Cornell;J. nat. Cancer Inst.,1969
4. Loss of malignancy by Novikoff hepatoma cells in vitro;Hsu;J. nat. Cancer Inst.,1959
5. Loss of neoplastic properties in vitro. I. Observation with S-180 cell lines;Foley;Cancer Res.,1964