Figure 5
From: Extreme specificity of NCR gene expression in Medicago truncatula
Shannon entropy. (A) Hierarchical clustering of the 9,000 probe-sets with the highest tissue specificity (lowest entropy values E g ). The expression heat map is in green-black-red colour scheme. The entropy heat map is in blue-black-yellow scheme. The experimental conditions (plant tissues) are in columns and their identities are marked above them. The genes are in rows and the preferential expression of clusters of genes is indicated on their right: ‘l/p/s/b’ indicates two clusters with preferential expression in the aerial tissues leaf, petiole, stem and bud; ‘r/n/m’ indicates a cluster with preferential expression in the underground tissues root, nodule and mycorrhiza. The other clusters labelled ‘root’, ‘seed’, ‘pod’, ‘flower’, ‘nodule’ or ‘mycorrhiza’ correspond to genes with specific expression in one of these tissues only. (B) The data set of panel (A) was ordered according to increasing entropy of the genes. The left panel shows the relative expression level of the 9,000 genes in the 10 tissues (green-black-red heat map) and the entropy values E g (blue-black-yellow heat map). The location of the NCR genes is indicated with the black-red heat map (NCR): red means NCR, black means other gene type. The right panel is an enlargement for the first 1,800 genes (entropy values E g from 0.07 to 1.64). The scale bar for the expression level heat map is green: 0, black: 0.5 and red: 1 and for the entropy heat map blue: 0, black: 1.44 and yellow: 2.88 (maximum entropy in the complete data set is 3.32 (log2(N)).