[1] UNIV CALIF SAN FRANCISCO,DEPT MED,SAN FRANCISCO,CA 94143
[2] UNIV CALIF SAN FRANCISCO,DEPT BIOCHEM & BIOPHYS,SAN FRANCISCO,CA 94143
[3] UNIV CALIF SAN FRANCISCO,DEPT PHARMACEUT CHEM,SAN FRANCISCO,CA 94143
[4] HOWARD HUGHES MED INST LAB,SAN FRANCISCO,CA 94143