7846
A reversed - phase high - performance liquid chromatographic ( HPLC ) method for the determination of cocaine metabolites produced in vitro by serum and liver esterases is described .
 GENE: serum and liver esterases
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
 Entities: serum and liver esterases 
Answer:
 GENE: serum and liver esterases