4877
Efficient gene activation requires the heterodimerization of VDR with Retinoid X Receptors ( RXR ).
 RXR, VDR, Retinoid X Receptors
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, VDR, Retinoid X Receptors