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In conclusion , our data demonstrate that miR - 21 contributes to renal fibrosis by mediating MMP9 / TIMP1 and that inhibition of miR - 21 may be a novel target for diabetic nephropathy .
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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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