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RegA is a positive yet nonessential regulator of tol - oprL expression .
 GENE: RegA; GENE: tol; GENE: oprL
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: RegA; GENE: tol; GENE: oprL