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Paraffin sections of normal yellow perch (Perca flavescens) retinas stained with H&E. A. Structure of the retina, photoreceptor layer, pigment epithelium, choroid and the rete mirabile which supplies high levels of O2 to the retina. B. Normal structure of the optic nerve, optic disc and cribiform plate. Bar = 100 μm. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
