15324
In this work , we sought to investigate the role of P - gp - mediated transport at the BBB in gender and strain - related variability of BUP and NBUP - induced respiratory effects in mice .
 Chemical: BUP; Chemical: NBUP
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: BUP; Chemical: NBUP