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We previously demonstrated marked differences in neurotransmitter changes produced by developmental lead ( Pb ) exposure +/- prenatal stress ( PS ) depending upon whether or not rats had been given BE ( Cory - Slechta , D .
 Chemical: Pb
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Pb