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A :HCl denaturation and methyl green-pyronin staining of differentiated Eca-109 cells (×1 000); B: HCl denaturation and methyl green-pyronin staining of proliferating Eca-109 cells (×1 000); C: TUNEL assay showing apoptotic Eca-109 cells (×1 000); D:TUNEL assay showing non-apoptotic Eca-109 cells (×1 000).
