5091
Transactivation studies showed that both the RAR ( Ro 13-7410 ) and RXR ( Ro 25-6603 and Ro 25-7386 ) ligands were highly selective at 100 nmol/L.
 RXR, RAR
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 RXR, RAR