G-CSF attenuates OPL thinning in OIR retinas. (A) Left panel: untreated control mouse retina; middle panel: G-CSF–treated mouse retina; right panel: vehicle-treated mouse retina. (B-D) Quantitative analysis. G-CSF–treated mice had thicker OPL than did vehicle-treated mice (n = 8 in each group). *P < .05. **P < .01. OIR mice had thinner OS than control mice. **P < .01. The OS thickness did not change by treatment (C). Outer nuclear layer (ONL) of OIR was same as control mice (D).