The lung is one of the most fascinating and intricate immunological sites of the human body. The lower respiratory tract is covered with a 75 m 2 monolayer of epithelial cells that separate the ...

1 Department of Mucosal Immunology, Research Institute for Microbial Diseases, Osaka University, Osaka 565, Japan 2 Department of Mucosal Immunology, Research Institute for Microbial Diseases, Osaka ...