14019
U937 cells differentiated with PMA in nonadherent culture were shown to express two fibrinogen-binding integrins , predominately CD11b/CD18 , and to a lesser extent, CD11c/CD18 .
 ( protein: CD11b/CD18, None) , ( cell line: U937 cells, None) , ( cell line: nonadherent culture, None) , ( protein: CD11c/CD18, None) , ( protein: fibrinogen-binding integrins, 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: CD11b/CD18, None) , ( cell line: U937 cells, None) , ( cell line: nonadherent culture, None) , ( protein: CD11c/CD18, None) , ( protein: fibrinogen-binding integrins, None) 