Figure 9A. SEM images at different magnifications of C2C12 cells cultivated onto cellulose acetate nanofiber (A, B, C) and cellulose acetate nanofiber with annatto extract (D, E, F) after seven days. Scale bars indicate (A) 200 µm; (D) 300 µm; (B, E) 50 µm; (C, F) 5 µm.