Figure 4. A) The evaluation of cell proliferation after 24, 48, and 72 hours at different concentrations of 5, 10, and 15μM for rh-EGF protein, 60, 120, and 180 μl for non-conjugated chitosan nanoparticles, and 5, 10, and 15μM for nanoparticles conjugated with rh-EGF protein with an optical microscope. B) Cell migration rate diagram which illustrates a 5-time increase against the control group for the cells that were treated with CS-EGF.