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The aim of this study was to explore the potential antimicrobial properties against Escherichia coli and / or Staphylococcus aureus of different extracts obtained from four Cistaceae species that are especially abundant in Spanish semi - arid regions .
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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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