[1] HARVARD UNIV, SCH MED, DEPT PEDIAT, BOSTON, MA 02115 USA
[2] DNAX RES INST CELLULAR & MOLEC BIOL, DEPT MOLEC BIOL, PALO ALTO, CA 94304 USA
[3] DNAX RES INST CELLULAR & MOLEC BIOL, DEPT IMMUNOL, PALO ALTO, CA 94304 USA
[4] UNICET, IMMUNOL RES LAB, F-69572 DARDILLY, FRANCE
[5] BETH ISRAEL HOSP, DEPT MED, BOSTON, MA 02215 USA
[6] BETH ISRAEL HOSP, CHARLES A DANA RES INST, BOSTON, MA 02215 USA
[7] BETH ISRAEL HOSP, DEPT PATHOL, BOSTON, MA 02215 USA