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Tardigrade and other ecdysozoan Toll pathway gene homologs. (A) The Drosophila melanogaster Toll pathway. (B) The presence (filled boxes) and absence (empty boxes) of D. melanogaster Toll pathway gene homologs in tardigrades and other ecdysozoans. LRR – extracellular leucine rich repeat domain; Mid – transmembrane domain; TIR – intracellular domain.
