This volume includes chapters originally presented at the 3rd FELASA Symposium, held in Amsterdam, June 1-5, 1987. Special topics were "Immune Deficiency Syndromes in Man and Animals", "DNA Technology and Laboratory Animal Science", "Interactions of Behaviour, Housing and Welfare", and "Laboratory Animals as Models in Biomedical Research". In addition, there was a great number of presentations concerning other aspects of laboratory animal science. We would like to thank the following persons for organizing the Symposium. Mrs. M.A.G. Kuipers, M.Sc., President FELASA Mrs. V. Baumans, D.V.M.,...