Institution: | (1) Veterinary Infectious Disease Organization, S7NOWO Saskatoon, Saskatchewan, Canada;(2) Swiss Institute of Allergy and Asthma Research, CH-7270 Davos, Switzerland;(3) Ciba-Geigy, Pharmaceutical Research, CH-4002 Basel, Switzerland;(4) Basel Institute of Immunology, CH-4005 Basel, Switzerland |