Figure 2. Analysis of in vitro proliferation activity of HD and HF BM-MMSC cells seeded at 3000 cells/cm2 and expanded in normoxia (pO2 =20%). (A) The population doubling time (PD) at passage 3; Data are presented as mean +/− SEM; n=16 for HF, and n=10 for HD; ** p <0.03; (B) CFU-F frequency in BM-MMSC samples at successive passages; Data are presented as mean +/− SEM; n=5. (C) The correlation analysis between CFU-F frequency and PD in BM-MMSC samples; (D) BM-MMSC CFU with low (left panel) and high (right panel) proliferation rate; (x50).