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We examined neuroimmune system effects in C57BL / 6J mice with Pb exposure , including levels that may be common among children in lower socioeconomic income environments .
 Chemical: Pb
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Pb 
Answer:
 Chemical: Pb