[1] Chiron Corp, Emeryville, CA 94608 USA
[2] Univ British Columbia, Dept Zool, Vancouver, BC V6T 1Z4, Canada
[3] Osaka Univ, Biomed Res Ctr, Dept Med Genet, Div Clin Genet, Osaka 5650871, Japan
[4] Osaka Univ, Microbial Dis Res Inst, Div Mol Biomed, Dept Med Genet, Osaka 5650871, Japan