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(A) General organization of the photoreceptor within the retina viewed by light microscopy after toluidin blue staining. ONL: Outer nuclear layer, IS: inner segments, OS: outer segments. (B) Overall view of high pressure frozen, cryo substituted rod photoreceptor nucleus observed by electron microscopy. C: Cytoplasm, EC: euchromatin, HCc: central Heterochromatin, HCp: nuclear envelope associated heterochromatin, NM nuclear envelope.
