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Phylogenetic tree of arthropod serine proteinases containing a clip domain. The tree is based on an alignment similar to that shown in Fig. 5, but also including Drosophila snake (p05049), M. sexta hemocyte proteinase 2 (HP2) (AF017664), and horseshoe crab clotting factor B (D14701). Numbers at nodes indicate bootstrap values (from 1,000 trials).
