title: Polarization optical studies on the ultrastructure of the photoreceptor.
mesh_terms: D000818:Animals; D001001:Anura; D002417:Cattle; D006041:Goats; D006652:Histological Techniques; D006736:Horses; D008859:Microscopy, Polarization; D010786:Photoreceptor Cells / Q000166:cytology*; D012160:Retina / Q000166:cytology*; D012756:Sheep; D013045:Species Specificity; D013194:Staining and Labeling; D013552:Swine