13171
We showed that the interaction of SS RBC at 2% concentration in the presence of multimers of von Willebrand factor ( vWf ), derived from endothelial cell-derived conditioned medium ( E-CM ) with cultured human umbilical vein endothelial cells ( HUVEC ), resulted in a fivefold increased formation of thiobarbituric acid-reactive substances ( TBARS ) and activation of the transcription factor NF-kB , both indicators of cellular oxidant stress .
 ( cell line: HUVEC, None) , ( protein: vWf, None) , ( protein: transcription factor, None) , ( cell type: SS RBC, None) , ( cell line: cultured human umbilical vein endothelial cells, None) , ( protein: von Willebrand factor, None) , ( protein: NF-kB, None) , ( cell type: endothelial 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 line: HUVEC, None) , ( protein: vWf, None) , ( protein: transcription factor, None) , ( cell type: SS RBC, None) , ( cell line: cultured human umbilical vein endothelial cells, None) , ( protein: von Willebrand factor, None) , ( protein: NF-kB, None) , ( cell type: endothelial cells, None) 