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Time-course alterations in the total and differential leukocyte counts in BAL fluid of rats exposed to SEA. BAL fluid was obtained after intratracheal injections of SEA (3.0 ng trachea−1) at the indicated time-periods. 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.
