2441
Incubation of human endothelial cells ( ECs ) in hypoxia , PO2 approximately 14-18 Torr, led to time-dependent release of IL-8 antigen into the conditioned medium; this was accompanied by increased chemotactic activity for PMNs , blocked by antibody to IL-8 .
 ( cell type: ECs, None) , ( protein: IL-8, None) , ( cell type: human endothelial cells, None) , ( protein: IL-8, None) , ( cell type: PMNs, 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 type: ECs, None) , ( protein: IL-8, None) , ( cell type: human endothelial cells, None) , ( protein: IL-8, None) , ( cell type: PMNs, None) 