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CFU-Fs of bMSCs and aMSCs. At different passages, bMSCs and aMSCs were plated in 6-well plates at 100 cells/well for 2 weeks and then stained with crystal violet. A) Images of crystal violet staining; B) quantification of CFU-Fs. ND: Not detected; *: P < 0.05 (n = 6).
