Scanning electron micrograph of a collecting tubule. This micrograph shows dark cells (asterisks), with numerous short lamellipodia or microridges on their surface, and light cells, each with a single cil-ium on its free surface along with small microvilli. The terms "light" and "dark" refer to the staining character of sectioned cells and not to the density differences reflecting charge characteristics of the coated surface of the specimen. (Courtesy of C. Craig Tisher.)
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