1. S. Banin, L. Moyal, Y. Shiloh, Y. Ziv, Department of Human Genetics and Molecular Medicine, Sackler School of Medicine, Tel Aviv University, Ramat Aviv 69978, Israel. S.-Y. Shieh and C. Prives, Department of Biological Sciences, Columbia University, New York, NY 10027, USA. Y. Taya, Biology Division, National Cancer Center Research Institute, Tsukiji 5-1-1, Chuo-ku, Tokyo 104, Japan. C. W. Anderson, Department of Biology, Brookhaven National Laboratory, 50 Bell Avenue, Upton, NY 11973, USA. L....