Fig. 4. The cell proliferation curve (a) and histogram (b) evaluated using CCK8 assay; the activities of ALP (c) and osteocalcin (d) of BMSCs cultured with the four scaffolds for 7, 14 and 21 days (n = 5, *p < 0.05, **p < 0.01, ***p < 0.001).
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