8502
Lysates from CD19 cross-linked 1E8 cells induced robust phosphorylation of an Elk-1 fusion protein in vitro, whereas no phosphorylation of Elk-1 fusion protein occurred using lysates from CD19 cross-linked BLIN-1 cells .
 ( cell line: 1E8 cells, None) , ( protein: Elk-1, None) , ( cell line: CD19 cross-linked BLIN-1 cells, None) , ( protein: Elk-1, None) , ( protein: Elk-1 fusion protein, None) , ( protein: Elk-1 fusion protein, None) , ( protein: CD19, 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:
 ( cell line: 1E8 cells, None) , ( protein: Elk-1, None) , ( cell line: CD19 cross-linked BLIN-1 cells, None) , ( protein: Elk-1, None) , ( protein: Elk-1 fusion protein, None) , ( protein: Elk-1 fusion protein, None) , ( protein: CD19, None) , ( protein: CD19, None) 