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Histopathology of PA-infected lungs. SP-A+/+ and SP-A−/− mice were infected with PAO1 or ΔpilA as described in figure 1. Representative HE-stained lung sections from SP-A+/+ and SP-A−/− mice (n = 5) 18 h after intranasal instillation of PAO1 (a, c) and ΔpilA (b, d) bacteria.
