12971
The inhibition of HIF - 2 alpha on the ATM / Chk - 2 pathway is involved in the promotion effect of arsenite on benzo ( a ) pyrene - induced cell transformation .
 Chemical: arsenite; 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: arsenite; Chemical: benzo ( a ) pyrene