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In this study we have used proteomic techniques to establish the effects of gentamicin on the proteomes of aerobic and oxygen - limited Escherichia coli .
 Chemical: gentamicin; Chemical: oxygen
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: gentamicin; Chemical: oxygen