Light micrograph of a glomerulus (central large circular structure) in a kidney affected by diabetes. The glomerulus undergoes an increase in matrix (dark black staining in central area) as well as the formation of microaneurysms (dark pink-red areas at the periphery of the glomerulus), which are dilations of the small blood vessels inside the glomerulus. Jones Silver stained tissue section. Magnification: x200 when printed at 10cm wide.