6724
To address the possible synergistic / antagonistic effects between PSMs and with standard antibiotics , special attention has been given to the antimicrobial activity of PSM - mixtures ( e . g . essential oils , plant extracts ) .
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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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