24740
MexZ , the negative regulator of the MexXY efflux pump , is found to be the most frequently mutated gene in P . aeruginosa isolated from cystic fibrosis patient lungs , confirming its importance in multidrug resistance .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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