JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Kidney proximal convoluted tubule, light micrograph. When a colorant, such a Trypan blue, is injected into the blood, the clearance of the colorant is made by the kidneys. The reabsorption of most of glomerular filtrate happens in the proximal convoluted tubules. The image shows several of these tubules labelled with Trypan blue. Magnification: x900 when printed at 10 centimetres wide.
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