[1] NYU, Sch Med, Skirball Inst Biomol Med, Dept Cell Biol & Physiol,Mol Neurobiol Program, New York, NY 10016 USA
[2] NYU, Sch Med, Skirball Inst Biomol Med, Dept Neurosci, New York, NY 10016 USA
[3] Cornell Univ, Weill Med Coll, New York, NY 10021 USA
[4] Millennium Pharmaceut Inc, Cambridge, MA 01239 USA