14798
We propose a model in which binding of a myeloid-specific factor ( PU.1 ) allows a general factor ( Sp1 ) to bind in a tissue-specific fashion thereby contributing to the myeloid-specific expression of CD11b .
 ( cell line: CD11b, None) , ( protein: Sp1, None) , ( protein: myeloid-specific factor, None) , ( protein: PU.1, 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 line: CD11b, None) , ( protein: Sp1, None) , ( protein: myeloid-specific factor, None) , ( protein: PU.1, None) 