14581
In the first part of the article , an updated overview of hepatic drug transporters is provided , followed by a state - of - the - art review of drug - transporter production and activity in primary hepatocyte cultures ( PHCs ) , being the gold - standard in vitro system .
 None
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:  
Answer:
 None