Methods
(critical point drying, hexamethyldisiloxane, repeats of osmium tetroxide-thiocarbohydrazide [OTOTO], and resin) in order to determine the method that best preserves the cell and cell interface morphology. Finally, to visualize the intracellular organelles and membrane, we compared the efficacy of four staining techniques: osmium tetroxide, osmium tetroxide and salts, osmium and uranyl acetate, and OTOTO. Experiments were performed on embryonic stem cell-derived photoreceptor precursors, neural cells, and a human retinal pigment epithelial cell line, which revealed that the optimal processing combination was resin drying and OTOTO staining, as manifested by preservation of cell morphology, the lowest percentage of cellular protrusion breakage as well as a high-quality image. The obtained