Expression pattern of dysregulated lung genes in mice exposed to mechanical ventilation using TIs or DIs after PBS or LPS aspiration. The expression levels of dysregulated lung genes identified using significance analysis of microarrays for LPS + DI versus PBS + TI comparison (A) and for LPS + TI versus PBS + TI comparison (B) are displayed by hierarchical clustering (using Bioconductor). Sample clustering is displayed at the top; gene clusters are displayed on the left; blue, white, and red represent expression levels below, at, and above mean level, respectively.