Effects of parenteral keyhole limpet hemocyanin or cholera toxin on intestinal immune response to keyhole limpet hemocyanin: Hamilton, S. R., Keren, D. F., Yardley, J. H. and Brown, G. (Department of Pathology, The Johns Hopkins University School of Medicine and Hospital, Baltimore, MD and Walter Reed Army Institute of Research, Department of Applied Immunology, Division of Communicable Diseases and Immunology, Washington, DC, U.S.A.) Int. Archs Allergy appl. Immun.68, 242 (1982)