Fig. 3
From: Cigarette smoke and electronic cigarettes differentially activate bronchial epithelial cells
Heatmap of the normalized array expression data. We extracted the 100 genes with the highest variance in expression over all samples and performed a hierarchical clustering with complete linkage and Euclidean distance. The resulting shows clearly a separation of the three analyzed groups into distinct clusters. The expression of the ECIG group (ECIG15–1 - ECIG15–4) seems to be more similar to the control samples (Ctr15–1 – Ctr15–4), while the TCIG group (TCIG15–1 – TCIG15–4) shows blocks of genes that are clearly differentially expressed compared to the two other groups