Quadruple fluorescence image revealing the complexity of the optic fiber layer of a mouse retina. Optic nerve axons and glial cells are stained red and green, respectively while actin in the blood vessel-ensheathing endothelial cells are stained blue. DNA and RNA are in orange. The image was acquired by confocal microscopy. By Thomas Deerinck, NCMIR
A rimmed hexagonal snow crystal, under an electron microscope, shows the incredible intricacies and imperfections in its structure that can never be replicated at a molecular level. Image credit: Electron and Confocal Microscopy Laboratory, Agricultural Research Service, U. S. Department of Agriculture.