Bionic Silk Fibroin Film Promotes Tenogenic Differentiation of Tendon Stem/Progenitor Cells by Activating Focal Adhesion Kinase

Figure 2

SEM and mechanical test. (a) Characterization of SF films: (A) the photograph of the SF film with a microstructure; (B–E) the SEM images of the SF film with a microstructure; (F) the photograph of the smooth SF film; (G–J) the SEM images of the smooth SF film; magnifications: 2,000x (B, G), 10,000x (C, H), 20,000x (D, I), and 100,000x (E, J). (b) Mechanical properties of the native tendon (group N), smooth SF film (group S), and SF film with a microstructure (group G): (A) maximum loading, (B) breaking elongation, (C) ultimate stress; .

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