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Transmission electron micrographs of M. leprae-infected epithelial cells. Epithelial cells were infected with live M. leprae for 24 h at 33°C. RPMI 2650 (A and C) and A549 (B and D) cells were fixed, processed, and visualized by transmission electron microscopy. The arrows point to bacteria; the arrowheads point to the membrane-bound compartments.
