Fig. 4.

Expression rate analysis of paired-containing genes from D. melanogaster. (A) Bayesian consensus phylogeny of five genes. Expression data are in brackets, columns represent expression in lateral cord, ventral nerve cord, anal pad, hypopharynx, central brain, CNS, optic lobe, mesoderm, labral segment, and Bolwig’s organ. 0 = not expressed, 1 = expressed. (B) Likelihood surface for the evolution of expression of paired gene family. Log likelihood of one-rate model is −33.81, and two-rate model is −33.57. Based on a two rate model, the estimated ratio of loss/gain is 1.3 (0.47/0.36).