Fig. 1

Phylogeny with split times and gene family expansion/contraction in the Muscovy duck and a set of related species. The phylogeny was estimated using a maximum likelihood analysis of a concatenation of 500 single copy orthologous protein sequences over 100 bootstrap replicates. Mus musculus and Homo sapiens were used as outgroups. Predicted species split times are plotted at each node. The numbers of expanded (green) and contracted (red) gene families are shown on branches. Horizontal bar plots (right) indicate the number of orthogroups that are species-specific (yellow), present in all 8 species (orange), or present in more than one but less than all species in the analysis (red)