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Apoptosis of BMSCs attached on HAp scaffolds under (a1–c1) static culture condition and (a2–c2) perfusion culture condition: a1–a2: HAp-L, b1–b2: HAp-M, c1–c2: HAp-S. Q1 represents necrotic cells; Q2 represents cells at a late stage of apoptosis; Q3 represents cells at an early stage of apoptosis; Q4 represents viable cells.
