1. Laboratory of Molecular Imnmunorepulation, Biological Response Modifiers Program, Division of Cancer Treatment, National Cancer Institute, Frederick, MD 21701.
2. Laboratory of Respiratory and Mucosal Immunity, Disease Assessment Division, U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, Frederick, MD 21701.
3. Laboratory of Cell Biology, National Cancer Institute, Bethesda, MD 20892.