Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
A and B: number of positive APA-1 and caspase-3 (Cas-3) cells counted in the lung parenchyma mainly in airway and alveolar epithelial cells and macrophages were increased after 3 and 6 wk of exposure compared with air-exposed controls. C and D: immunostaining scores of staining for APA-1 and caspase-3 in airway epithelial cells of ozone-exposed lungs. Data are expressed as means ± SE. *P < 0.05; **P < 0.01; ***P < 0.001.
