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  • Colorized scanning electron image of HIV-1 particles being tethered to the surface of an infected cell by the host defense protein BST-2 (tetherin). Colorized scanning electron image of HIV-1 particles being tethered to the surface of an infected cell by the host defense protein BST-2 (tetherin). Colorized scanning electron image of HIV-1 particles being tethered to the surface of an infected cell by the host defense protein BST-2 (tetherin).