Light micrograph of a glomerulus. The glomerulus (circular structure occupying most of the image) is the structure in the kidney though which filtration of the blood occurs. The glomerulus consists of many capillary loops supported by a tree-like mesangial matrix (black). Tubules (red-pink) are seen around the glomerulus in this image. Silver stained tissue section. Magnification: 200x when printed at 10cm.