16114
To evaluate to what extent the regional differences in expression of P - gp and P450 enzymes affect the absorption of a dual substrate , we investigated the transport of darunavir across different small intestinal segments ( duodenum , proximal jejunum and ileum ) .
 darunavir
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 darunavir