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Succimer chelation improves learning , attention , and arousal regulation in lead - exposed rats but produces lasting cognitive impairment in the absence of lead exposure .
 Chemical: Succimer; Chemical: lead; Disease: cognitive impairment; Chemical: lead
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: lead; Disease: cognitive impairment; Chemical: lead