Heat map of organ and tissue-specific expressed genes . A total of 731 organ/tissue-specific genes identified by the Shannon entropy based method were analyzed by hierarchical clustering. A heat map was constructed using the relative expression values of the genes based on correlation distance and average linkage method. As a result, the 731 genes were grouped into 7 clusters based on organ/tissue-specificity of gene expression. High expression values are shown in red. Details of the samples used for each organ and tissue are described in Table 1.