Figure 7. RGCs-related genes expression in E13.5 RPCs during 8 day proliferation culture The “X” letter in the y-axis represents Brn3b, Math5, or Islet1. GAPDH served as an internal control. Note that the expression of Brn3b, Math5, and Islet1 weakly increased after 4 day culturing, followed by a dramatic decrease after 8 day. Data was mean±standard deviation (n=3).