[1] UNIV UPPSALA,CTR BIOMED,DEPT MED & PHYSIOL CHEM,BOX 575,S-75123 UPPSALA,SWEDEN
[2] GOTHENBURG UNIV,DEPT ORAL PATHOL,S-41124 GOTHENBURG,SWEDEN
[3] TNO,CTR PRIMATE,RIJSWIJK,NETHERLANDS
[4] KAROLINSKA INST,DEPT CLIN IMMUNOL,S-10401 STOCKHOLM 60,SWEDEN