Fig. 2
Gene expression profile among 51 tissue types. a Principal component analysis for all tissue types based on corrected expression data through log2 (FPKM+1). Tissues are colored according to organ systems as the same as in Fig. 1. b Unbiased hierarchical clustering heat map based on Pearson’s correlation coefficient for all genes. Color intensity indicates the correlation between tissues, red indicates high correlation (1), and blue indicates low correlation (0.5)