11137
A novel transcriptional repressor PhaR for the steroid - inducible expression of the 3 , 17 beta - hydroxysteroid dehydrogenase gene in Comamonas testosteroni ATCC11996 .
 steroid, 3 , 17 beta - hydroxysteroid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 steroid, 3 , 17 beta - hydroxysteroid