12663
We hypothesized that styrene metabolites have lower affinity than styrene toward CYP2E1 and limited ability to induce cooperative effects during metabolism .
 Chemical: styrene; Chemical: styrene
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: styrene, styrene 
Answer:
 Chemical: styrene; Chemical: styrene