1. Division of Immunotherapy, Department of Surgery, University of Michigan School of Medicine, Ann Arbor, MI 48109, USA.
2. Department of Pathology, University of Michigan School of Medicine, Ann Arbor, MI 48109, USA.
3. Department of Internal Medicine, University of Michigan School of Medicine, Ann Arbor, MI 48109, USA.
4. Institute of Biophysics, Chinese Academy of Science, Beijing, China.