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The use of a luciferase reporter assay confirmed that miR - 193b directly regulates STMN1 by targeting the 3 ' - untranslated region of STMN1 mRNA .
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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:
 None