12560
In the case of thymic selection the mechanism is more subtle depending on the mutual repression of Nur77 and GR .
 protein: Nur77; protein: GR
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: Nur77, GR 
Answer:
 protein: Nur77; protein: GR