6306
We have examined the effect of Rb expression on the activation of the promoter for HLA-DRA , the prototype class II gene .
 prototype class II gene, Rb, HLA-DRA
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:
 prototype class II gene, Rb, HLA-DRA