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Scanning electron microscopy observation of PET (A), PET+SF (B), and PET+SF+HAP (C); inset pictures are amplified. Three-dimensional topography of PET (D), PET+SF (E), and PET+SF+HAP (F), acquired by atomic force microscopy in tapping mode.
Abbreviations: HAP, hydroxyapatite; PET, polyethylene terephthalate; SF, silk fibroin.
