14900
Consistent with these findings , HEP and HCB had additive or synergistic effects on cell proliferation induction within the preneoplastic foci and cytochrome P450 ( CYP ) 2B1 and 3A1 induction , which may lead to more efficient metabolic activation of HEP and HCB .
 Chemical: HEP; Chemical: HCB; Chemical: HEP; Chemical: HCB
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: HEP; Chemical: HCB; Chemical: HEP; Chemical: HCB