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Immunofluorescence staining of the hepatic functional protein, albumin (green excitation λ = 448 nm), in HepG2 cells cultured on (A) RGD TiO2-nanograting pattern; and (B) TiO2-nanograting pattern alone; and (C) RGD-flat surface compared to cells cultured on (D) Flat surface alone (control); (E) Relative mean fluorescence intensity calculated using Image J for HepG2 cultured on biofunctionalized TiO2 substrates * Statistical significance at (p < 0.05).
