[1] Burnham Inst, Program Signal Transduct, La Jolla, CA 92037 USA
[2] Burnham Inst, Program Bioinformat, La Jolla, CA 92037 USA
[3] Salk Inst Biol Studies, Mol & Cell Biol Lab, La Jolla, CA 92037 USA
[4] Univ Calif San Diego, Sch Med, Dept Pharmacol, La Jolla, CA 92093 USA