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Regulation of irgA by iron in V . cholerae occurs at the transcriptional level , and there is an interrupted dyad symmetric sequence in the vicinity of the promoter that is homologous to Fur binding sites of E . coli .
 GENE: irgA; GENE: Fur binding sites
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: irgA; GENE: Fur binding sites