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Succimer treatment of the Pb - exposed rats significantly improved learning , attention , and arousal regulation , although the efficacy of the treatment varied as a function of the Pb exposure level and the specific functional deficit .
 Chemical: Succimer; Chemical: Pb; Chemical: Pb
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: Succimer; Chemical: Pb; Chemical: Pb