1. Ubiquitin Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan
2. Biochemistry Section, Surgical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, United States
3. Department of Cell Biology, Harvard Medical School, Boston, United States
4. Institute of Biochemistry II, School of Medicine, Goethe University, Frankfurt, Germany
5. Institute of Microbial Chemistry, Tokyo, Japan
6. Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan
7. Division of Molecular Cell Engineering, National Institute of Genetics, Research Organization of Information and Systems, Mishima, Japan
8. Department of Genetics, SOKENDAI, Mishima, Japan
9. Division of Molecular Cell Engineering, National Institute of Genetics, ROIS, Mishima, Japan
10. Laboratory of Protein Metabolism, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan