5331
Of importance , ectopic overexpression and silencing of endogenous RBCK1 in primary human hepatocytes resulted in a decrease and increase , respectively , in endogenous PXR protein levels and in the induction of PXR target genes by rifampicin .
 Chemical: rifampicin
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: rifampicin