7217
Although many functions of human alveolar macrophages are altered compared with their precursor cell , the blood monocyte ( monocyte ), the reason(s) for these functional changes have not been determined.
 ( cell type: blood monocyte, None) , ( cell type: human alveolar macrophages, None) , ( cell type: precursor cell, None) , ( cell type: monocyte, 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: blood monocyte, None) , ( cell type: human alveolar macrophages, None) , ( cell type: precursor cell, None) , ( cell type: monocyte, None) 