Figure 4
From: Evolutionary functional elaboration of the Elovl2/5 gene family in chordates

Evolutionary scenario of LC-PUFA biosynthesis functional diversification in Bilateria.
(A) PUFA elongase substrate preference in octopus, amphioxus, lamprey, elephant shark, zebrafish, chicken and human; (B) schematic view of gene duplication events in the elongation/desaturation network along the invertebrate/vertebrate transition (top left) and known enzymatic activities of FADS and ELOVL (right; from top to bottom: octopus, amphioxus, lamprey and the gnathostomes elephant shark and human); Δ5 and Δ6 denote desaturation activities.