4870
In the present study , to investigate whether characteristic expression profiles of PAHs exist in rat liver and whether a characteristic molecular signature can discriminate and predict among different PAHs at an early exposure time , we analyzed the genome - wide expression profiles of rat livers exposed to PAHs [ benzo [ a ] anthracene ( BA ) , benzo [ a ] pyrene ( BP ) , phenanthrene ( PA ) and naphthalene ( NT ) ] .
 Chemical: PAHs; Chemical: PAHs; Chemical: PAHs; Chemical: benzo [ a ] anthracene; Chemical: benzo [ a ] pyrene; Chemical: phenanthrene; Chemical: naphthalene
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: PAHs; Chemical: PAHs; Chemical: PAHs; Chemical: benzo [ a ] anthracene; Chemical: benzo [ a ] pyrene; Chemical: phenanthrene; Chemical: naphthalene