12000
To understand the possible mechanism of PhIP - associated stomach cancer , the effects of PhIP on morphology , oxidative stress , gene expression of c - fos , c - jun and p16 in rat stomachs were investigated .
 Chemical: PhIP; 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: PhIP; Chemical: PhIP