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Effects of 2 - amino - 1 - methyl - 6 - phenylimidazo [ 4 , 5 - b ] pyridine ( PhIP ) on histopathology , oxidative stress , and expression of c - fos , c - jun and p16 in rat stomachs .
 Chemical: 2 - amino - 1 - methyl - 6 - phenylimidazo [ 4 , 5 - b ] pyridine; Chemical: PhIP
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: 2 - amino - 1 - methyl - 6 - phenylimidazo [ 4 , 5 - b ] pyridine; Chemical: PhIP