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Dose-dependent alterations in the total and differential leukocyte counts in BAL fluid of rats exposed to SEA. The BAL fluid was obtained after intratracheal injection of SEA (4 h) at the indicated doses. Panels a–d show counts of total leukocytes, neutrophils, lymphocytes and macrophages, respectively. The black bars indicate the counts obtained with PBS alone. The data are the mean values±s.e.m. of six rats. *P<0.05 compared with respective PBS group.
