5082
Both primary activation, with phytohemagglutinin or antibodies to CD3 , and costimulation , provided by pairs of CD2 antibodies or B7-positive (B cells) or B7-negative (endothelial) accessory cells, are mediated through the same cis-elements .
 ( cell type: B7-positive (B cells), None) , ( protein: CD2 antibodies, None) , ( DNA: cis-elements, None) , ( protein: antibodies to CD3, None) , ( protein: phytohemagglutinin, None) , ( cell type: B7-negative (endothelial) accessory cells,, 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:
 ( cell type: B7-positive (B cells), None) , ( protein: CD2 antibodies, None) , ( DNA: cis-elements, None) , ( protein: antibodies to CD3, None) , ( protein: phytohemagglutinin, None) , ( cell type: B7-negative (endothelial) accessory cells,, None) 