5914
The strong association of the disease with an epitope within the HLA-DR chain shared between various alleles of HLA-DR4 and DR1 emphasizes the importance of antigen presentation .
 ( protein: DR1, None) , ( protein: HLA-DR4, None) , ( protein: HLA-DR chain, None) , ( protein: epitope, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: DR1, None) , ( protein: HLA-DR4, None) , ( protein: HLA-DR chain, None) , ( protein: epitope, None) 