8812
Thirteen of 15 patients with SS and 4/17 controls were HLA-DR3 positive , with no apparent association of HLA-DR3 with SSB reactivity in controls .
 ( protein: SSB, None) , ( protein: HLA-DR3, None) , ( protein: HLA-DR3, 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: SSB, None) , ( protein: HLA-DR3, None) , ( protein: HLA-DR3, None) 