Hierarchical clustering and heatmap showing the segregation of samples by tissue type. (a) Hierarchical clustering of normal tissue samples shows segregation by tissue type (red, adjacent epithelium; blue, reduction epithelium; green, adjacent stroma; orange, reduction stroma). (b) Heatmap showing tissue specific gene expression clusters.
Finak et al. Breast Cancer Research 2006 8:R58 doi:10.1186/bcr1608