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Total and differential cell count of BAL fluid. Neutrophil numbers following Taiyuan (CH) PM is significantly different from sham control (CTRL), while exposure to Sacramento (CA) PM is much higher than both Taiyuan and sham control numbers. Data is presented as mean (SEM) from 6 animals. * indicates significant difference to sham control. # indicates significant difference to Taiyuan PM (p<0.05 by one-way ANOVA).
