Figure 2

Hierarchical clustering of 59 genes representing functional categories over-represented in the normal bronchial airway transcriptome. Supervised hierarchical clustering of the expression of 59 probesets representing genes in the mucin, dynein/microtubule, cytochrome P450, glutathione, aldehyde dehydrogenase, and keratin functional categories across samples from 11 tissue datasets. Nasal and bronchial epithelial samples cluster together based on similar expression patterns across these groups of genes (high expression = red, average expression = white, low expression = blue).