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Renal collecting tubules. Light micrograph of a section through a healthy human kidney showing the collecting tubules (large ovals, seen end-on). The outer layer of each tubule is formed from cuboidal epithelial cells, whose nuclei are stained dark purple. Each collecting tubule forms part of a nephron. The nephrons are the functional units of the kidney that filter waste products from the blood to form urine. The tubules drain the filtered blood into the collecting ducts (not seen), from where the waste and excess water that form the urine are transported to the bladder. Magnification unknown.
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