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Morphological changes and β-gal staining of EM cells. Morphology of EM-E6/E7/TERT-2 cells (A) at PD 51 and EM-E6/E7 cells (B) at PD 40. β-gal expression was observed in EM-E6/E7 cells (D) whereas no staining was detected in EM-E6/E7/TERT cells (C).
