Fig. 1: Phylogenetic analysis of insulin-related peptides (RAxML method).

Species: Bcal Branchiostoma californiense (California amphioxus), Bbel B. belcheri tsingtauense (Chinese amphioxus), Bflo B. floridae (Florida amphioxus), Cgig Crassostrea gigas (Pacific oyster), Smim Stegodyphus mimosarum (spider), Lsta Lymnaea stagnalis (snail), Acal Aplysia californica (sea hare), Tdio Tritonia diomedea (sea slug), Dmel Drosophila melanogaster (fruitfly), Tcas Tribolium castaneum (beetle), Znev Zootermopsis nevadensis (termite), Cele Caenorhabditis elegans (nematode). Some species are covered by collapsed sub-trees, see Supplementary Data 1, Figs. 1 and 2 for details.