Transmission electron micrographs (TEMs) showing the apical region of a cell of a kidney proximal tubule (top) and a similar region (bottom) after the use of ruthenium red, an electron dense marker filtered in the kidney glomerulus and reabsorbed in the proximal tubule, where it can be seen in pinocytic vesicles and lysosomes. Note the abundance of pinocytic vesicles under the brush border microvilli in the top image.

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Photo credit: © JOSE CALVO / SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: -, biological, biology, black, border, brush, cell, convoluted, cytological, cytology, electron, endocytosis, glycocalyx, healthy, histological, histology, intestine, kidney, membrane, micrograph, microscope, microscopy, microvilli, monochrome, normal, plasma, proximal, tem, tems, transmission, tube, tubule, tubules, ultrastructure, white