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Relative gene expression ratios for three Krüppel-like factors in human bone marrow stromal cells (hBMSCs) cultured in M1, M2, and M3. a Klf2 expression was significantly increased in M1 over M2 and M3. **p < 0.01. b Klf5 expression was upregulated in M1 compared with the other two media. **p < 0.01. c Klf4 expression was higher only at passage 2 in M1 cultures. **p < 0.01
