5599
In reviewing a number of the most intensely studied environmentally inducible promoters it becomes clear that the presence of two cis - acting elements are critical for promoter activity , one of which is the G - box ( CCACGTGG ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
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