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We selected 18 genes as candidate biomarkers for papillary injury based on previously published studies and analyzed their expression profiles by RT - PCR in each kidney region , namely the cortex , cortico - medullary junction , and papilla in various nephrotoxicity models .
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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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