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Represents in vitro cytocompatibility of DLC coated PEEK substrates, (a) surface morphology of hBMSC cultured on PEEK, DLC-PEEK, and NH2-DLC-PEEK substrates for 1 day, and the enlarged cells are shown in pseudo-color, (b) cell viability for 1 day, and (c) proliferation of hBMSCs after culturing samples for 1 d, 3 d, and 7 days [235]. ** denotes p < 0.01.
