Fig. 4.

Bayesian inference of ancestral states. Vertical lines at zero in each of the three distributions indicate equal expression between the paralogs. Frequency shows the relative proportion of samples (20,000) falling within a bin of 0.2. The distribution represents the marginal posterior distribution of each ancestral state given the measured expression in each species. (A) Panel of posterior distributions for the three ancestral states assuming µ_root = 0. (B) Panel of posterior distributions for the three ancestral states assuming a conservative prior of P(µ_root) = N(0,10) for the state after the genome duplication.