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Double labeling Ki-67/4',6-diamidino-2-phenylindole dihydrochloride (DAPI) (red and blue fluorescence, respectively) to determine the proportions of cycling cells of control (A,B) and GFs + proteins–treated (C,D) human alveolar bone-derived osteoblastic cell cultures grown on titanium discs at days 1 (A,C) and 4 (B,D). Bar = 50 μm.
