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Spaceflight microgravity inhibits proliferation of murine HSPCs. A) Microscopic appearance of cultured HSPCs under normal ground control and spaceflight conditions. Original magnification, ×20. B) Change in cell number of HSPCs after culture under normal ground control and spaceflight conditions for 12 d. C) Ki67 staining analysis of HSPC proliferation after culture under normal ground control and spaceflight conditions for 12 d. **P < 0.01.
