Figure 2.

Schematic representation of the amphiouxus non-LTR elements and the phylogenetic relationships. (A) Phylogenetic tree based on the reverse transcriptase sequence with only the branch points (and neighbor-joining bootstrap support) leading to the major 14 clades of non-LTR elements. (B) Schematic representation of the characterised domains. The APE domains and RT blocks are numbered below each element. (C) The main features (length, copy number, assembled composites, range of similarity) defining each non-LTR retrotransposon clade are indicated