This image, winner of the Federation of American Societies for Experimental Biology's 2017 BioArt competition, shows the brain of an adult zebrafish, a popular organism for studying brain function. It captures dense networks of blood vessels (red) lining the outer surface of the brain. Next to many of these vessels are previously little-studied cells called fluorescent (yellowish-green) granular perithelial cells. Researchers now believe that these cells, often abbreviated as FGP, carry a lot like garbage cans that constantly absorb and store waste to keep the brain clean and functioning properly.