[1] Mt Sinai Sch Med, Dept Genet & Genom Sci, New York, NY 10029 USA
[2] European Mol Biol Lab, Gene Express Unit, D-69117 Heidelberg, Germany
[3] Abbot Germany, D-65205 Wiesbaden, Germany
[4] Nagoya Univ, Biosci & Biotechnol Ctr, Chikusa Ku, Nagoya, Aichi 464, Japan
[5] Deutsch Krebsforschungszentrum, D-69120 Heidelberg, Germany