Figure 1From: Gene expression profile of human lung epithelial cells chronically exposed to single-walled carbon nanotubes Hierarchical clustering of SWCNT-exposed and passage control cell gene expression following 6 months of continuous treatment. The hierarchical clustering was based on differentially expressed genes of SWCNT vs. control comparison using p < 0.05 and fold changes >2 criteria. Color indicates log2-transformed normalized intensities with red and blue indicating over- and underexpression, respectively.Back to article page