Figure 5

The proliferation of hMSCs on the bFGF-His-7 immobilized surfaces treated with citrate buffer solution for different time periods. The hMSC proliferation assays were performed 6 days after seeding. Data are expressed as the mean ± standard deviation for n = 4. Student’s t-test was performed to analyze significance in difference compared with the control sample with no citrate buffer treatment (*p < 0.05).