Phylogenetic tree for vertebrate IFITM proteins. The tree was constructed using the Neighbourhood joining method with 1000 bootstraps. Green shading denotes the cluster of general eutherian IFITMs, orange the marsupial IFITM cluster, pink the IFITM10 cluster and blue the IFITM5 cluster. Only IFITMs for which complete (or almost complete) protein sequence was available were included in this analysis. Opo, opossum; tam, tammar; mus, mouse; chk, chicken; zfsh, zebrafish; liz, lizard; ply, platypus.