JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Light micrograph of a renal medulla showing several collecting ducts lined by a simple columnar epithelium. Among them, there are many cross-sectioned capillaries and loops of Henle. Semithin resin section 0.5 micrometres thick stained with toluidine blue Magnification: x180 when printed at 10 centimetres wide.
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