12
Transporter - enzyme interplay was studied with several in vitro models of varying complexity : rat small intestine and Caco - 2 cell monolayers were used in studies of intestinal processes , and hepatic pharmacokinetics was monitored in HepG2 cells , isolated rat hepatocytes and rat liver slices .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None