1. Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, CO 80309, USA.
2. Institute of Molecular and Cellular Biology, National Taiwan University, Taipei, Taiwan 10617.
3. Program in Cell Biology, Department of Pediatrics, National Jewish Medical and Research Center, Denver, CO 80206, USA.
4. Department of Physiology, Tokyo Women's Medical University, School of Medicine, Tokyo, 162-8666, Japan.