6907
Activity against macrovascular EC ( HUVEC ) and microvascular EC ( human bone marrow EC immortalized by SV40 ) antigens was detected by enzyme-linked immunosorbent assay .
 ( cell line: HUVEC, None) , ( cell line: human bone marrow EC immortalized by SV40, None) , ( cell line: microvascular EC, None) , ( cell line: macrovascular EC, 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) , ( cell line: human bone marrow EC immortalized by SV40, None) , ( cell line: microvascular EC, None) , ( cell line: macrovascular EC, None) 