Fig. 1From: The Dfam community resource of transposable element families, sequence models, and genome annotationsTypical phylogenetic structure of retroposon and DNA transposon families. After multiple mutations have occurred in the evolving class I TE, the relative ordering of copies may be distinguished by these changes as they cosegregate. The presence of such clusters or “subfamilies” of TE copies is a good indication that they arose via retrotranspositionBack to article page