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Inhibition by anti- VCAM-1 monoclonal antibody 1G11 indicated that U937 adhesion was VCAM-1 dependent and suppression by antioxidants was due to reduced VCAM-1 induction .
 ( protein: VCAM-1, None) , ( protein: VCAM-1, None) , ( protein: VCAM-1, None) , ( protein: 1G11, None) , ( protein: anti- VCAM-1 monoclonal antibody, None) , ( cell line: U937, 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: VCAM-1, None) , ( protein: VCAM-1, None) , ( protein: VCAM-1, None) , ( protein: 1G11, None) , ( protein: anti- VCAM-1 monoclonal antibody, None) , ( cell line: U937, None) 