JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Light micrograph of a cross section of a collecting duct, located in the medullary region of the kidney. It is lined by a simple columnar epithelium. Semithin resin section 0.5 micrometres thick stained with toluidine blue. Magnification: x900 when printed at 10 centimetres wide.
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