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.
 protein: alpha receptor; protein: IgE
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: alpha receptor, IgE 
Answer:
 protein: alpha receptor; protein: IgE