1. Institute of Molecular and Cell Biology (IMCB), 61 Biopolis Drive, Proteos, Singapore 138673, Singapore.
2. Department of Biochemistry, National University of Singapore (NUS), 8 Medical Drive, Singapore 117597, Singapore.
3. Cell Cycle and Development Laboratory, Peter MacCallum Cancer Centre, St Andrews Place, East Melbourne, 3002 Victoria, Australia.
4. Anatomy and Cell Biology Department, University of Melbourne, Victoria 3010, Australia.
5. Biochemistry and Molecular Biology Department, University of Melbourne, Victoria 3010, Australia.