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Multidrug resistance - associated proteins are involved in the transport of the glutathione conjugates of the ultimate carcinogen of benzo [ a ] pyrene in human Caco - 2 cells .
 Chemical: glutathione; Chemical: benzo [ a ] pyrene
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: glutathione; Chemical: benzo [ a ] pyrene