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Cell proliferation of CD133+CD44+ Hep2 and TU-177 cells. (A,B) CD133-CD44-, CD133-CD44+, CD133+CD44-, CD133+CD44+ and parental Hep2 (A) and TU-177 (B) cells were seeded onto 96-well plates, and cell counts were determined by CCK-8 assay at the indicated times. Data are expressed as mean ± SD of three independent experiments.
