8499
Cross-linking CD19 on early human B lineage cells induces the formation of a CD19 /Vav/phosphatidylinositol-3 kinase complex , tyrosine phosphorylation of CD19 and Vav , and activation of the Ras pathway .
 ( protein: Ras, None) , ( cell type: human B lineage cells, None) , ( protein: CD19, None) , ( protein: CD19 /Vav/phosphatidylinositol-3 kinase complex, None) , ( protein: CD19, None) , ( protein: Vav, None) , ( protein: CD19, 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: Ras, None) , ( cell type: human B lineage cells, None) , ( protein: CD19, None) , ( protein: CD19 /Vav/phosphatidylinositol-3 kinase complex, None) , ( protein: CD19, None) , ( protein: Vav, None) , ( protein: CD19, None) 