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Urinary protein excretion in the PAN group increased significantly , peaking at 8 days , then decreased at 4 weeks , but rose again significantly at 14 and 20 weeks .
 Chemical: PAN
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: PAN