6778
SLP-76 and Vav , two hematopoietic cell specific molecules , are critical for T cell development and activation.
 ( protein: SLP-76, None) , ( protein: hematopoietic cell specific molecules, None) , ( protein: Vav, 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: SLP-76, None) , ( protein: hematopoietic cell specific molecules, None) , ( protein: Vav, None) 