1. Department Biology II, Center for Integrated Protein Science Munich, Ludwig Maximilian-University Munich, Planegg, 82152, Germany
2. Institute of Molecular and Cellular Biology, National Taiwan University and
3. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, 10617, Taiwan
4. Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Colorado 80309