Figure 1

Hierarchical clustering analysis of differentially expressed genes among placental and other human tissues. We calculated expression levels of 51,682 Ensembl genes in each tissue and selected those expressed with FPKM > 5 in 8 or more tissues, which were then ranked based on their coefficient of variation (CV). The heat map was generated by average linkage hierarchical clustering of the top 1,000 differentially expressed genes, using 1-Pearson correlation coefficient as the distance metric. Scaled expression values are color-coded according to the legend in the top left corner.