Hierarchical clustering of PCT from C.IL6/iMyc mice (n = 11) and C.IL6 mice (n = 10) based on global gene expression analysis. Dendrogram at the top shows the samples studied, and their relationships based on similarities in gene expression. C.IL6/iMyc samples included 7 primary (G0) and 4 transplanted (2 G1, 2 G2) tumors. Dendrogram at the left shows the expression patterns of genes across all samples with intensities depicted according to the color scale at the top. The bars above the heat map are color-coded according to genotype and labeled with array numbers.