Gene family expansion and contraction across the nine study species. a The number of gene families involved in expansions and contractions are shown in red and blue, respectively, with the size of each node representing the significance of the expansion or contraction. Human was the outgroup used for this analysis. The species tree was based on the Species Tree Inference from All Genes (STAG) method. b The ancestor chart of the nine GO terms of genes from gene families with significant gene gains and losses in gaur. The terms are coloured in a gradient of increasing redness to indicate significance of enrichment.