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In order to be able to make a meaningful in vivo - in vitro comparison we estimated internal in vivo B [ a ] P concentrations using DNA adduct levels and physiologically based kinetic modeling .
 Chemical: B [ a ] P
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: B [ a ] P