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Flow cytometric apoptosis analysis of MSCs cultured under hypoxia or normoxia for 2 weeks. BM-MSCs derived from five different donors were cultured and maintained under hypoxia or normoxia for 2 weeks. Cell apoptosis was assessed using flow cytometry-based annexin V-FITC and PI. Annexin V staining is indicative of apoptosis; PI staining is indicative of apoptosis and necrosis
