24689
These results indicate a major role of CYP2B6 in ketamine N - demethylation in vitro and a significant impact of the CYP2B6 * 6 allele on enzyme - ketamine binding and catalytic activity .
 Chemical: ketamine; Chemical: ketamine
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: ketamine, ketamine 
Answer:
 Chemical: ketamine; Chemical: ketamine