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Phylogenetic analysis of sequences of the external, and internal TIRs of PM-ZIBP elements. TIR end is indicated by 5′ for TIR sequences from the left end and 3′ for TIR sequences from the right end. Sequence names ending in “Ex” indicate external TIRs while sequence names ending in “In” indicate internal TIRs. Sequences were aligned and phylogeny was reconstructed as described for Figure 3.
