DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Transmission electron micrograph of the principal cells of the lining epithelium of the human epididymal duct, containing multivesicular bodies and other lysosomes. This epithelium is active in endocytosis; coated vesicles and multivesicular bodies are a conspicuous feature of their apical cytoplasm. The more common dense lysosomes are also abundant.
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