5325
In the present study , yeast two - hybrid screening identified an E3 ubiquitin ligase , RBCK1 ( Ring - B - box - coiled - coil protein interacting with protein kinase C - 1 ) , as a human pregnane X receptor ( hPXR ) - interacting protein .
 Chemical: pregnane
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: pregnane