[1] Cold Spring Harbor Lab, Cold Spring Harbor, NY 11724 USA
[2] European Bioinformat Inst, Cambridge CB10 1SD, England
[3] NYU, Sch Med, New York, NY 10016 USA
[4] St Johns Univ, Coll Pharm & Allied Hlth Profess, Queens, NY 11439 USA
[5] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA