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(upper panel). Retina; Gnptab−/− mouse. There is a severe reduction in the thickness of both the inner and outer segments of the photoreceptors as well as the outer nuclear layer. HE.
(lower panel). Retina; 2-year-old Gnptg−/− mouse. In marked contrast, there is no evidence of retinal degeneration in aged Gnptg−/− mice. HE.
