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Apoptosis of alveolar macrophages in tumour necrosis factor receptor 1-deficient (TNFR1−/−) mice. Wild-type C57BL/6 mice or TNFR1−/− mice were intratracheally infected with Mycobacterium bovis BCG. After 3 days of infection, alveolar macrophages were stained with annexin V and 7-aminoactinomycin D for analysis of apoptosis by flow cytometry. Each bar represents mean ± SE. One representative experiment of two with similar results is shown. *P < 0.05 versus control, #P < 0.05.
