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Effects of E-rGO/HAp composites on calcium deposition and matrix mineralization in hMSCs. (a) Digital images of ARS staining and (b) quantification of mineralized nodule formation on hMSCs cultured with HAp, E-rGO, and E-rGO/HAp. The asterisks represent statistical differences between groups (**** p < 0.0001, n = 6).
