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PKC - alpha null mice ( PKCa KO ) and strain - matched wild type ( WT ) controls were treated with lithium for 0 , 3 or 5 days .
 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