[1] UNIV VIRGINIA,DEPT PHARMACOL,CHARLOTTESVILLE,VA 22908
[2] UNIV VIRGINIA,DEPT INTERNAL MED,CHARLOTTESVILLE,VA 22908
[3] UNIV PITTSBURGH,SCH MED,DEPT PEDIAT,PITTSBURGH,PA 15261
[4] CHILDRENS HOSP,PHILADELPHIA,PA 19104
[5] MASSACHUSETTS GEN HOSP,DEPT MOLEC BIOL,BOSTON,MA 02114
[6] SALK INST BIOL STUDIES,SAN DIEGO,CA 92138