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Blood Pb levels in exposed animals at sacrifice ( post - natal day 28 ) ranged from 2 . 66 to 20 . 31 mu g / dL .
 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