Fig. 6. (A ) Neutrophil accumulation in the lung. Lungs of acid-exposed and control animals were homogenized, and myeloperoxidase was analyzed. Values are means ± SEM from five animals. White bars represent values from control animals, and black bars represent values from animals after HCl stimulation. Asterisks indicate maximally enhanced myeloperoxidase values of acid-exposed animals with statistically significant difference compared to control animals. *P < 0.01. (B ) Cell analysis in bronchoalveolar lavage fluid (BALF). Rats were exposed to acid for 0.5, 1, 2, 4, 6, and 8 h. Cells were analyzed by Diff-Quick. The gray portions of the bars represent alveolar macrophages, whereas the black portions reflect neutrophils. Values are means ± SEM from five animals. Asterisks indicate statistically significant difference from animals exposed to acid compared with control animals. *P < 0.05. (C ) Cell analysis in bronchoalveolar lavage fluid (BALF) showing percentage of neutrophils. Values are means ± SEM from five animals. White bars represent values from control animals, and black bars represent values from animals after HCl stimulation. Asterisks indicate statistically significant difference concerning neutrophil accumulation from animals exposed to acid compared with control animals. *P < 0.05.