Phylogenetic analysis and amino acid alignment analysis were performed using MEGA 7 [64 (link)]. For phylogenetic analysis, evolutionary history was inferred using the neighbor-joining method [65 (link)]. The percentages of replicate trees in which the associated taxa clustered together in the bootstrap test (1000 replicates) were determined as previously described [66 (link)]. The evolutionary distances were computed using the Poisson correction method and are in units of the number of amino acid substitutions per site. Protein sequence of Vasa were downloaded from National Center for Biotechnology Information. The accession numbers are as follows: Plutella xylostella, XP_037961717.1; D. rerio, CAA72735.1; M. musculus, EDL18409.1; Tribolium castaneum, NP_001034520.2; B. mori, NP_001037347.1; Manduca sexta, NP_001037347.1; X. laevis, NP_001081728.1; C. elegans, NP_491113.1; D. melanogaster, NP_723899.1; Nasonia vitripennis, XP_001603956.3; Amyelois transitella, XP_013187571.1; Helicoverpa armigera, XP_021190483.1; Aedes aegypti, XP_021700879.1; Bicyclus anynana, XP_023939227.1; and Danaus plexippus, XP_032519693.1.
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