Fig. 4
Evolutionary rate of 3’ UTR length. a The phylogeny used in rate estimation. The rates were estimated in cichlid and non-cichlid groups separately. b Comparison of evolutionary rate of 3’ UTRs between cichlids and non-cichlids. The ratios of the rate in cichlids to that in non-cichlids are calculated for 2.041 1:1 orthologous genes. These ratios were log10-transformed. In general, 3’ UTRs in cichlids have significant higher evolutionary rates than in non-cichlids (one-sample t-test that the mean log10 ratio = 0.0; p < 0.001). The top 5% relatively fastest evolving 3’ UTRs were further analyzed for enrichment of gene functions (GO terms and KEGG pathways)