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We measured the expression levels of matrix metalloproteinases ( MMPs ) and tissue inhibitors of MMPs in the presence or absence of TNF - alpha using quantitative , real - time polymerase chain reaction and enzyme - linked immunosorbent assays .
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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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