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Phylogenetic tree of non-LTR elements based on the reverse transcriptase sequence. The elements identified in C. intestinalis are indicated with an asterisk. The number next to each node of the 14 clades indicates the bootstrap value as the percentage out of 1,000 replicates. The name of each non-LTR element and the species harboring it is listed to the right of the figure, shaded in light gray (protostomes) or dark gray (deuterostomes).
