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The expression of arginine vasopressin ( AVP ) gene in the paraventricular ( PVN ) and supraoptic nuclei ( SON ) was investigated in rats with lithium ( Li ) - induced polyuria , using in situ hybridization histochemistry and radioimmunoassay .
 arginine vasopressin, AVP, lithium, Li, polyuria
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 arginine vasopressin, AVP, lithium, Li, polyuria