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Heterogeneous mononuclear cellular aggregates observed in mice after 2 wk of once-daily intranasal inhalation with DE (12.5%). A and B depict a different, but representative (2 of 4 mice), serial 4- to 5-μm-thick lung section of a focal mononuclear aggregate stained with anti-CD3 antibody for T lymphocytes, anti-murine CD45R/B220 antibody for B lymphocytes, and anti-Mac-3 antibody for phagocytes.
