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Fig. 3 | Biomaterials Research

Fig. 3

From: Induction of chondrogenesis of human placenta-derived mesenchymal stem cells via heparin-grafted human fibroblast derived matrix

Fig. 3

Preparation of collagen spheroids. a Collagen spheroids containing hPMSCs and hFDM-hep; b–d Collagen spheroids containing hPMSCs, hFDM-hep and live cell tracking dye (PKH26) at different time points in vitro; e Release profile of TGF-β1 from three different groups of collagen spheroids for 28 days in vitro. CS: collagen spheroid. Scale bar is 200 μm

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Biomaterials Research

ISSN: 2055-7124

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