7216
Human alveolar macrophages are markedly deficient in REF-1 and AP-1 DNA binding activity .
 ( protein: REF-1, None) , ( protein: AP-1, None) , ( cell type: Human alveolar macrophages, 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: REF-1, None) , ( protein: AP-1, None) , ( cell type: Human alveolar macrophages, None) 