Introductory slides for Session 4 Images removed due to copyright considerations. See Fig. 2 in David J. Katzmann, Greg Odorizzi & Scott D. Emr RECEPTOR DOWNREGULATION AND MULTIVESICULAR-BODY SORTING Nature Reviews Molecular Cell Biology 3, 893 -905 (2002); doi:10.1038/nrm973 See Fig. 7 in: Katzmann DJ, Stefan CJ, Babst M, Emr SD. Vps27 recruits ESCRT machinery to endosomes during MVB sorting. J Cell Biol. 2003 Aug 4;162(3):413-23. Figure by MIT OCW. After Fig. 2 in Amara, A and Littman, DR. 2003. After Hrs with HIV. J. Cell Biol., 162: 371-375.