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Here we analyze fragments of these three genes from 90 species to determine whether they can well resolve higher relationships within this superfamily , whether structurally aligned sequence datasets increase phylogenetic signal , and whether the inclusion of highly variable regions introduces noise .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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