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Although phylogenetic studies are increasingly utilizing multi - locus datasets , a review of GenBank data for the Gastropoda indicates a strong bias towards a few short gene fragments ( most commonly COI , LSU rRNA , and SSU rRNA ) .
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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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