8803
Using the [3H]thymidine proliferation assay , we determined reactivity to purified recombinant SSB ( rSSB ) in 20 patients with SS and 19 controls .
 ( protein: purified recombinant SSB, None) , ( protein: rSSB, 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: purified recombinant SSB, None) , ( protein: rSSB, None) 