17216
This study was to determine whether miR - 21 was involved in diabetic nephropathy and to explore the relationship between miR - 21 and MMP9 / TIMP1 expression in 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:
 None