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These data show that the spv virulence genes belong simultaneously to several regulons in the cell , raising the possibility that spv expression can be fine - tuned in response to multiple environmental inputs .
 spv virulence genes, spv
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 spv virulence genes, spv