[1] ERASMUS UNIV,DEPT CELL BIOL IMMUNOL & GENET,3000 DR ROTTERDAM,NETHERLANDS
[2] STATE UNIV UTRECHT,FAC MED,DEPT CELL BIOL,UTRECHT,NETHERLANDS
[3] BRIGHAM & WOMENS HOSP,CTR NEUROL DIS,BOSTON,MA 02115
[4] HARVARD UNIV,SCH MED,BOSTON,MA 02115
[5] ROTTERDAM RADIO THERAPEUT INST,DEPT IMMUNOL,ROTTERDAM,NETHERLANDS