The alternative phylogenetic relationships among the taxa involved in the three evolutionary hypotheses considered. (a) Placental mammals: primates, laurasatheria and rodents. (b) Ecdysozoa versus Coelomata hypothesis: relationships among arthropods, chordates and nematodes. And (c) the Unikont hypothesis: relationship among opisthokonts, amoebozoans and other eukaryotic groups. The numbers indicate the number of trees supporting each topology. For each alternative topology numbers on the top row refer to the total number of trees with a given topology, and what percentage of the total it represents; numbers in the middle row refer to those trees for which the posterior probabilities of the two partitions shown in the figure are 0.9 or higher. Numbers in the bottom row refer to the number and percentage of gene families supporting each topology.