Fig. 1

Analysis of orthologous gene families. a. Unique and shared gene families between the S. caffer genome and other species. b. Evolution of ortholog gene clusters. The estimated numbers of ortholog groups in the common ancestral species are shown in the internal nodes. The numbers of orthologous groups that have expanded or contracted in each lineage are shown on the corresponding branch, with + referring to expansion and – referring to contraction. The S. caffer genome has 10,988 orthologous gene families and a total of 7321 are shared among four species. A total of 62 are shared exclusively between S. caffer and B. taurus and 179 predicted genes that are unique to S. caffer. Both figures were based on the comparison of orthologous gene families among thirteen mammalian species