Overexpression of P97 affects photoreceptor survival in Gγ1-/- mice. A–F, Morphology of Gγ1-/- retinas with or without P97 overexpression at three (A–C) or six (D–F) months of age. A, D, Spider diagrams representing the number of photoreceptor nuclei in 100-μm segments of the inferior and superior retina at various distances from the optic nerve head. The number of mice analyzed at three months of age was the following: WT, 3; Gγ1-/-, 7; Gγ1-/-/P97oe, 3. The number of mice analyzed at six months of age was the following: WT, 4; Gγ1-/-, 6; Gγ1-/-/P97oe, 4. B, E, The total number of nuclei in all eight 100-μm retinal segments represented in panels A, D. C, F, Representative images of inferior and superior retina cross-sections at the 1-mm distance from the optic nerve head. Scale bar = 25 μm. Data are shown as mean ± SD. n.s. indicates p > 0.05. **p < 0.01.