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Transgenic mice lacking P - glycoprotein ( P - gp ) and breast cancer resistance protein ( Bcrp ) were used to study efflux of erlotinib at the BBB .
 Chemical: erlotinib
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: erlotinib