Address correspondence to Marika Sarfati, University of Montreal, Laboratoire Allergie (M4211-K), Centre de Recherche du CHUM, Campus Notre-Dame, 1560 Sherbrooke Street East, Montreal, Quebec H2L 4M1, Canada. Phone: 514-281-6000 ext. 6632; Fax: 514-896-4753; E-mail: sarfatm@poste.umontreal.ca M. Armant’s present address is Laboratory for Parasitic Diseases, Bldg. 4, National Institutes of Health, Be- thesda, MD 20892-0425. M. Kiniwa’s present address is Immunological and Cardio-Vascular Research Lab., Hanno Research Center, Taiho Pharmaceutical Company Ltd., Saitama 357, Japan. Submitted: 6 November 1998 Revised: 13 August 1999 Accepted: 20 August 1999 References 1. Gately, M.K., L.M. Renzetti, J. Magram, A.S. Stern, L. Adorini, U. Gubler, and D.H. Presky. 1998. The interleu- kin-12/interleukin-12-receptor system: role in normal and pathologic immune responses. Annu. Rev. Immunol. 16: 495–521. 2. Sutterwala, F.S., G.J. Noel, R. Clynes, and D.M. Mosser. 1997. 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