10767
Stimulation of purified T lymphocytes by a combination of monoclonal antibodies directed at CD2 and CD28 adhesion molecules gives rise to a long lasting proliferation in the absence of accessory cells .
 ( protein: adhesion molecules, None) , ( protein: CD2, None) , ( protein: CD28, None) , ( cell type: accessory cells, None) , ( protein: monoclonal antibodies, 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: adhesion molecules, None) , ( protein: CD2, None) , ( protein: CD28, None) , ( cell type: accessory cells, None) , ( protein: monoclonal antibodies, None) 