Figure 2.

Estimation of the Rates of Expression Divergence across the Seven Organs.

(A) Unrooted phylogeny tree constructed with the NJ algorithm to infer the evolutionary distances for tissue expression. The NJ branch length may represent the degree of expression divergence.

(B) Expression divergences of the seven organs computed based on the NJ tree lengths. The red dots and the corresponding boxes represent the observed values and the simulated distributions using the bootstrapping method, respectively. The left and right panels show the expression divergences deduced from all of the orthologs and the transcription factor genes, respectively.