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The glomerular capillary walls are made up of three layers: 1)Endothelium which has relatively large pores (70-100 nanometers in diameter), which solutes, plasma proteins, and fluid can pass through, but not blood cells. 2)Basement membrane; a membrane that is also made up of three layers, and is fused to the endothelial layer. Its job is to prevent plasma proteins from being filtered out of the bloodstream. 3)Epithelium-this layer consists of specialized cells called podocytes (cells are attached to the basement membrane) by foot processes (pedicels). They wrap around the capillaries but leave slits between them, known as filtration slits. A thin diaphragm between the slits acts as a final filtration barrier before the fluid enters the glomerular space.