Figure 2

A polyserine insert is found in MyoD1 proteins from species that retain both MyoD1 and MyoD2 genes. Teleost species phylogeny is shown for all species with complete MyoD1 and MyoD2 data available; the tree by [20] was trimmed using R packages to only include those species with data available. Gene information was subsequently overlaid to this tree and branches coloured to represent the species differences in MyoD genes found in the genome. Black lines indicate species with a single MyoD gene with no polyserine insert. Red lines indicate the presence of MyoD1 and MyoD2 genes where the MyoD1 sequence includes a polyserine insertion. The blue line indicates a lineage specific duplication of MyoD1; MyoD1 proteins in this case do not include a polyserine insert. The phylogeny indicates that the polyserine insertion in MyoD1 is only found in species which have retained a MyoD2 gene.