Figure 4
From: Correspondence regarding "Effect of active smoking on the human bronchial epithelium transcriptome"
Hierarchical clustering using Chari et al. methodology on the null and the actual dataset. Counts for SAGE tags that met a threshold p-value cutoff of 0.05 for the null hypothesis of never = current smokers. The counts were row normalized and underwent single-link hierarchical clustering using a Pearson correlation as a distance metric. The left-hand tree represents the actual dataset and the right-hand tree represents the null dataset.