Figure 4From: Toxicogenomic analysis of susceptibility to inhaled urban particulate matter in mice with chronic lung inflammation Hierarchical clustering of arrays to examine structure at the sample level. All 40 arrays were clustered by average linkage using block-adjusted data without prior gene selection. The bars at the base of the figure display the factors Genotype (WT, white; TNF, black), Time (0 h, white; 24 h, grey), and Treatment (air, white; PM, hatched) for each sample.Back to article page