13617
Using retinoids with different receptor binding specificity ( CD336 , CD437 , CD2019 , CD367 ), dose-dependent inhibition of IgE synthesis was shown by all four derivates, but was most marked by an RA binding the alpha receptor with high specificity.
 alpha receptor, IgE
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:
 alpha receptor, IgE