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"Brains are gorgeous at the right magnification", says Mark Miller on his "neuro" set of photos in flickr. Self-described as an intracellular recording artist, Miller shows images of a mouse's neuronal network. Covering different areas of the brain such as the cingulated cortex or motor cortex, the images are quite impressive, particularly since the neurons connecting in the brain resemble the large-scale structure of the universe.

These neurons were grown in a special chamber that separates axons from dendrites. The axons (red) have grown while the dendrites (green or light blue) stay behind. This is part of work that will help us understand changes in the aging brain. Photo credit: Pamela J. Yao, Laboratory of Neurosciences, #NIA