Chapter 2 Exosomes contain ubiquitinated proteins Sonja I. Buschow 1,2 , Jolanda M.P. Liefhebber 1 , Richard Wubbolts 1 , Willem Stoorvogel 1 1 Faculty of Veterinary Medicine, Dept. of Biochemistry & Cell Biology and Institute of Biomembranes, Utrecht University, P.O. box 80.176, NL-3508 TD, Utrecht, The Netherlands; 2 Department of Cell Biology, University Medical Center, Utrecht University, 3584 CX Utrecht, The Netherlands Blood Cells Mol Dis 35:398 (2005).