9087
The effects of high intensity light emissions , produced by a novel pulsed power energization technique ( PPET ) , on the survival of bacterial populations of verocytotoxigenic Escherichia coli ( serotype 0157 : H7 ) and Listeria monocytogenes ( serotype 4b ) were investigated .
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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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