GFAP and infection: Indeed, by 2–3 weeks post-infection, within the GCL of retinas infected with GFAP-Math5-Brn3b-tdTomato AAVs, the majority of tdTomato-positive cells were also immunoreactive for GFP as well as Rbpms, whereas in control retinas, tdTomato-positive cells remained immunoreactive only for Sox9 but negative for either GFP or Rbpms (Figure 4B).