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IFNα enhances tumorsphere formation ability in HN4 and HN30 cells. (A) Representative images of tumorsphere formation in conditioned medium with indicated concentration of IFNα (2ng/ml; 20ng/ml) for 2 weeks. Scar bar: 1mm. (B) Quantitation of the number of tumorsphere formation in HN4 and HN30 cells in the presence and absence of IFNα incubation. (C) Sphere forming efficiency of HN4 and HN30 cells in the presence and absence of IFNα incubation.
