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(a) Cell proliferation results obtained in AB assay of hBMSCs culture directly on test materials over a period of 21 days; (b) DNA (µg/mL) in cell lysate over a period of 14 days; (c) ALP/DNA activity over a period of 14 days. Results are the mean ± sd (n = 4). Asterisks (*) indicate a significant difference comparing blank and Sr(II) samples at the same time (* p < 0.05). Ch: chitosan; PCL: poly(ε-caprolactone).
