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