Fig. 3
From: Identification of RAG-like transposons in protostomes suggests their ancient bilaterian origin
Bilaterian evolutionary tree and RAG evolutionary history. Tree was built with species for which there are at least one WGS and/or TSA project in the NCBI database. The species in which there are no RAG-like sequences found were regrouped into larger groups (Xenacoelomorpha, Platyhelminthes, Nematoda, Tardigrada, Arthropoda phyla), and the Gnathostome species were grouped as well, as RAG is domesticated in all of these species. Several species contain RAG1L-RAG2L copies with different statuses (e.g., one copy is potentially active and another is fossilized), and in such cases, the species are annotated as having more than one status within the status box. Red lines indicate branches in which RAGL transposon activity might have been present