Light micrograph of membranous and crescentic lupus nephritis. In patients with lupus, the kidneys may be affected. In this kidney glomerulus, tiny white holes in the glomerular basement membrane (black) indicate membranous type of disease. There is also a crescent within this glomerulus (collection of pink cells) indicating activity of the lupus disease in the kidney. Jones silver stained tissue section. Magnification: 200x when printed at 10 centimetres.