1. Division of Centrosome Biology, Department of Molecular Genetics, National Institute of Genetics, Mishima, Shizuoka 411-8540, Japan
2. Department of Genetics, School of Life Science, Graduate University for Advanced Studies (SOKENDAI), Mishima, Shizuoka 411-8540, Japan
3. Swiss Institute for Experimental Cancer Research (ISREC), School of Life Sciences, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland