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. 2001 Jan;158(1):179–188. doi: 10.1016/S0002-9440(10)63956-9

Figure 10.

Figure 10.

Electron micrographs of Listeria-infected macrophages. Listeria cell ratio was set at 10:1 (1 × 10 6 Listeria for 1 × 10 5 cells). A: Listeria are phagocytosed and incorporated in phagosomes of MSR-A+/+ macrophages at 20 minutes after infection. Original magnification, ×5,000. Inset: 2F8 is expressed on the phagosomal membrane. Immunoelectron microscopy using 2F8; original magnification, ×4,000. B: In MSR-A−/− macrophages, the majority of Listeria are present in single form at 20 minutes after infection. Original magnification, ×4,000. C: Most Listeria are confined within large vacuoles (phagolysosomes) at 30 minutes after infection in MSR-A+/+ macrophages. Original magnification, ×5,000. Inset: 2F8 is not expressed on the phagosomal membrane. Immunoelectron microscopy using 2F8; original magnification, ×4,000. D: Most Listeria are remaining in single form, and no large phagosomes are found at 30 minutes after infection in MSR-A−/− macrophages; original magnification, ×4,000. E: Vacuolar membranes encircle Listeria in MSR-A+/+ macrophages, and several Listeria are degraded at 30 minutes after infection. Original magnification, ×10,000. F: In MSR-A−/− macrophages, the vacuolar membranes are partially disrupted (arrows). A division of Listeria in the cytoplasm (arrowhead). Original magnification, ×20,000. G: In MSR-A+/+ macrophages, phagosomes are fused with lysosomes, and most Listeria are undergoing degradation at 1 hour after infection. Acid phosphatase staining; original magnification, ×4,000. H: Few phagosomes of MSR-A−/− macrophages have fused with lysosomes at 1 hour after infection. Acid phosphatase staining; original magnification, ×4,000.