Unsupervised hierarchical clustering of mouse mammary tumor and human breastcancer gene expression data. Across the top, the dendrogram illustratesthe relationship between human and mouse tumor samples on the basis of geneexpression profiles. The red bars mark the intrinsic subtype of each humantumor sample according the annotation on the same line. The blue barscorrespond to the mouse mammary tumor type. Below this, a heatmap shows thegene expression patterns for each sample, with expression values illustratedaccording to the color bar on the right. The dendrogram beside the heatmapshows the correlation between genes based on expression patterns across thesamples in the dataset.