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Alizarin Red S staining of human bone marrow stromal cells (hMSCs) on four groups of scaffolds.
Notes: hMSCs cultured on (A) pure poly-ε-caprolactone and poly-ε-caprolactone with (B) 5 wt%, (C) 10 wt%, and (D) 15 wt% nano-hydroxyapatite scaffolds at 21 days in common medium.
