Figure 1.

Memory T cells in the lung airways are CD11a^lo. Mice were infected with Sendai virus and lymphocytes isolated from the lung airways and spleen on Day 40 after infection for flow cytometric analysis. Data in the left panels identify CD8⁺ T cells specific for the dominant NP_324-332/K^b epitope of Sendai virus. Data in the right panels are gated on NP_324-332/K^b-specific T cells and show the distinct patterns of CD11a expression on these cells depending on whether they are isolated from the spleen or lung airways.