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Immunoblotting , immunohistochemistry , and quantitative ( q ) RT - PCR consistently detected a significant decrease in aquaporin - 2 ( AQP2 ) protein expression in both the renal cortex and medulla of lithium - treated + / + mice .
 Chemical: lithium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: lithium