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Fig. 2. (A) Sequence alignment of full-length SPN-4 and related Drosophila, mouse and human proteins. Grey indicates regions of similarity. The mutations found in or25 and or191ts both result in G to E substitutions at highly conserved positions in the RRM (amino acids 213 to 300). (B) A molecular phylogeny based on the sequence similarities among SPN-4 related proteins. The length of a branch is proportional to the number of amino acid changes; SPN-4 is the most diverged member.





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