Fig. 4

IR evolution in Heliconius butterflies. a Number of genes per branch under positive diversifying selection as determined using HyPhy’s branch-site random effects likelihood model [51]. Most positive selection maps onto the H.melpomene/H. cydno clade and H.sara/H.sapho clade. The phylogeny taken from Kozak et al. [52]. b Overview of gene duplication, pseudogenization and gene loss in Heliconius, D. plexippus and B. mori. Duplications of IR60a1 and IR60a2 map within the Heliconius genus. IR7d4 is shared by the butterflies but not with the moth