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Photographs of surface modified titanium and ceramic discs with or without HGF taken using SEM: (A, F, K) machined titanium surface (MT), (B, G, I) polished titanium surface (PT), (C, H, M) titanium coated with titanium nitride (CT), (D, I, N) machined ceramic surface (MC), (E, J, O) polished ceramic surface (PC), (C, H, M). HGFs were cultured for 1 day (F-J) and for 5 days (K-O), respectively. Magnification: ×200.
