1. Immunology Domain, Hoechst Roussel, 93235 Romainville, France
2. Immunology Domain, Hoechst Roussel, Swindon SN3 5BZ, U.K.
3. Central Research, Roussel UCLAF, 93235 Romainville, France
4. Immunologie Cellulaire et Clinique, INSERM U255, Institut Curie, 75231 Paris, France