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Representative apoptosis results of ADMSCs by flow cytometer. Viable cells were stained by Annexin V−/PI− (LL quadrant). The Annexin V+/PI− cells were in the early process of apoptosis (LR quadrant), whereas the Annexin V+/PI+ cells had lost cell membrane integrity and entered the late phase of apoptosis (UR quadrant). Necrotic cells indicated in Annexin V−/PI+ staining (UL quadrant)
